diff --git a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/Config.java b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/Config.java
index 7d85a52..b8d75b3 100644
--- a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/Config.java
+++ b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/Config.java
@@ -18,6 +18,8 @@ import org.apache.commons.cli.HelpFormatter;
 import picocli.CommandLine;
 
 import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.*;
 import java.util.regex.Pattern;
 
@@ -45,7 +47,7 @@ public class Config {
     private boolean safeMode;
 
     @Getter(AccessLevel.NONE)
-    @CommandLine.Option(names = {"-m", "--mkvtoolnix"}, defaultValue = "C:\\Program Files\\MKVToolNix", description = "path to mkvtoolnix installation")
+    @Setter(AccessLevel.NONE)
     private File mkvToolNix;
 
     @Min(value = 1)
@@ -80,8 +82,20 @@ public class Config {
 
     @CommandLine.Option(names = {"-l", "--library"}, required = true, description = "path to library")
     public void setLibraryPath(File libraryPath) {
-        this.libraryPath = libraryPath;
         if (!libraryPath.exists()) throw new CommandLine.ParameterException(spec.commandLine(), "Path does not exist: " + libraryPath.getAbsolutePath());
+        this.libraryPath = libraryPath;
+    }
+
+    @CommandLine.Option(names = {"-m", "--mkvtoolnix"}, defaultValue = "C:\\Program Files\\MKVToolNix", description = "path to mkvtoolnix installation")
+    public void setMkvToolNix(File mkvToolNix) {
+        this.mkvToolNix = mkvToolNix;
+        if (!mkvToolNix.exists()
+                || !Path.of(getPathFor(MkvToolNix.MKV_MERGER)).toFile().exists()
+                || !Path.of(getPathFor(MkvToolNix.MKV_PROP_EDIT)).toFile().exists()) {
+            throw new CommandLine.ParameterException(spec.commandLine(),
+                    "Invalid path to mkvtoolnix installation: " + mkvToolNix.getAbsolutePath());
+        }
+
     }
 
     public static Config getInstance() {
diff --git a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/MkvToolNixPathConfigParameterTest.java b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/MkvToolNixPathConfigParameterTest.java
new file mode 100644
index 0000000..519645d
--- /dev/null
+++ b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/MkvToolNixPathConfigParameterTest.java
@@ -0,0 +1,19 @@
+package at.pcgamingfreaks.mkvaudiosubtitlechanger.config;
+
+import at.pcgamingfreaks.mkvaudiosubtitlechanger.Main;
+import org.junit.jupiter.api.Test;
+import picocli.CommandLine;
+
+import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.CommandLineOptionsUtil.optionOf;
+import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.TestUtil.args;
+import static org.junit.jupiter.api.Assertions.*;
+
+class MkvToolNixPathConfigParameterTest {
+
+    @Test
+    void validate() {
+        Main sut = new Main();
+        assertThrows(CommandLine.ParameterException.class, () -> CommandLine.populateCommand(sut, args("-m", "./")));
+        assertThrows(CommandLine.ParameterException.class, () -> CommandLine.populateCommand(sut, args("-m")));
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PathConfigParameterTest.java b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PathConfigParameterTest.java
index 1cb778b..d5aaaca 100644
--- a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PathConfigParameterTest.java
+++ b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PathConfigParameterTest.java
@@ -1,10 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.config;
 
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.Main;
-import org.apache.commons.cli.CommandLineParser;
-import org.apache.commons.cli.DefaultParser;
-import org.apache.commons.cli.Options;
-import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -16,23 +12,12 @@ import java.nio.file.Path;
 import java.util.function.Function;
 import java.util.stream.Stream;
 
-import static at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ConfigProperty.LIBRARY;
-import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.CommandLineOptionsUtil.optionOf;
 import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.PathUtils.TEST_DIR;
 import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.PathUtils.TEST_FILE;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 class PathConfigParameterTest {
-    private static CommandLineParser parser;
-    private static Options options;
-
-    @BeforeAll
-    static void before() {
-        parser = new DefaultParser();
-        options = new Options();
-        options.addOption(optionOf(LIBRARY, LIBRARY.abrv(), LIBRARY.args()));
-    }
 
     private static Stream<Arguments> provideTestCases() {
         return Stream.of(
diff --git a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PatternConfigParameterTest.java b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PatternConfigParameterTest.java
index 569de48..ec010c1 100644
--- a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PatternConfigParameterTest.java
+++ b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/PatternConfigParameterTest.java
@@ -22,15 +22,6 @@ import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.TestUtil.argumentsO
 import static org.junit.jupiter.api.Assertions.*;
 
 class PatternConfigParameterTest {
-    private static CommandLineParser parser;
-    private static Options options;
-
-    @BeforeAll
-    static void before() {
-        parser = new DefaultParser();
-        options = new Options();
-        options.addOption(optionOf(INCLUDE_PATTERN, INCLUDE_PATTERN.abrv(), INCLUDE_PATTERN.args()));
-    }
 
     private static Stream<Arguments> provideTestCases() {
         return Stream.of(
diff --git a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validator/MkvToolNixPathValidatorTest.java b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validator/MkvToolNixPathValidatorTest.java
deleted file mode 100644
index fb66685..0000000
--- a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/config/validator/MkvToolNixPathValidatorTest.java
+++ /dev/null
@@ -1,65 +0,0 @@
-package at.pcgamingfreaks.mkvaudiosubtitlechanger.config.validator;
-
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.config.ValidationResult;
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ConfigProperty;
-import at.pcgamingfreaks.yaml.YAML;
-import at.pcgamingfreaks.yaml.YamlInvalidContentException;
-import org.apache.commons.cli.CommandLineParser;
-import org.apache.commons.cli.DefaultParser;
-import org.apache.commons.cli.Options;
-import org.apache.commons.cli.ParseException;
-import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.Arguments;
-import org.junit.jupiter.params.provider.MethodSource;
-
-import java.io.File;
-import java.nio.file.Path;
-import java.util.stream.Stream;
-
-import static at.pcgamingfreaks.mkvaudiosubtitlechanger.config.ValidationResult.*;
-import static at.pcgamingfreaks.mkvaudiosubtitlechanger.config.ValidationResult.MISSING;
-import static at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ConfigProperty.*;
-import static at.pcgamingfreaks.mkvaudiosubtitlechanger.util.CommandLineOptionsUtil.optionOf;
-import static org.junit.jupiter.api.Assertions.*;
-
-class MkvToolNixPathValidatorTest {
-    private static final String TEST_INVALID_DIR = "src/test/resources/test-dir";
-    private static final String TEST_MKVTOOLNIX_DIR = "src/test/resources/mkvtoolnix";
-    private static final String TEST_MKVTOOLNIX_EXE_DIR = "src/test/resources/mkvtoolnix_exe";
-
-    private static CommandLineParser parser;
-    private static Options options;
-
-    @BeforeAll
-    static void before() {
-        parser = new DefaultParser();
-        options = new Options();
-        options.addOption(optionOf(MKV_TOOL_NIX, MKV_TOOL_NIX.abrv(), MKV_TOOL_NIX.args()));
-    }
-
-    private static Stream<Arguments> provideTestCases() {
-        return Stream.of(
-                Arguments.of(MKV_TOOL_NIX, false, null, "", new String[]{"-m", TEST_MKVTOOLNIX_DIR}, VALID),
-                Arguments.of(MKV_TOOL_NIX, true, null, "", new String[]{"-m", TEST_MKVTOOLNIX_EXE_DIR}, VALID),
-                Arguments.of(MKV_TOOL_NIX, false, null, "mkvtoolnix: " + TEST_MKVTOOLNIX_EXE_DIR, new String[]{}, VALID),
-                Arguments.of(MKV_TOOL_NIX, true, null, "mkvtoolnix: " + TEST_MKVTOOLNIX_DIR, new String[]{}, VALID),
-                Arguments.of(MKV_TOOL_NIX, false, Path.of(TEST_MKVTOOLNIX_EXE_DIR).toFile(), "", new String[]{}, DEFAULT),
-                Arguments.of(MKV_TOOL_NIX, false, null, "", new String[]{}, NOT_PRESENT),
-                Arguments.of(MKV_TOOL_NIX, true, null, "", new String[]{}, MISSING),
-                Arguments.of(MKV_TOOL_NIX, true, null, "", new String[]{"-m", TEST_INVALID_DIR}, INVALID)
-        );
-    }
-
-    @ParameterizedTest
-    @MethodSource("provideTestCases")
-    void validate(ConfigProperty property, boolean required, File defaultValue, String yamlArgs, String[] cmdArgs,
-                  ValidationResult expectedResult) throws ParseException, YamlInvalidContentException {
-        MkvToolNixPathValidator underTest = new MkvToolNixPathValidator(property, required, defaultValue);
-
-        ValidationResult result = underTest.validate(new YAML(yamlArgs), parser.parse(options, cmdArgs));
-
-        assertEquals(expectedResult, result);
-    }
-
-}
\ No newline at end of file