diff --git a/FFMpegCore.Test/Utilities/WindowsOnlyDataTestMethod.cs b/FFMpegCore.Test/Utilities/WindowsOnlyDataTestMethod.cs
index 01fce23..8c10054 100644
--- a/FFMpegCore.Test/Utilities/WindowsOnlyDataTestMethod.cs
+++ b/FFMpegCore.Test/Utilities/WindowsOnlyDataTestMethod.cs
@@ -7,7 +7,7 @@ public class WindowsOnlyDataTestMethod : DataTestMethodAttribute
 {
     public override TestResult[] Execute(ITestMethod testMethod)
     {
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
         {
             var message = $"Test not executed on other platforms than Windows";
             {
diff --git a/FFMpegCore.Test/Utilities/WindowsOnlyTestMethod.cs b/FFMpegCore.Test/Utilities/WindowsOnlyTestMethod.cs
index 0dc4b9e..29300e3 100644
--- a/FFMpegCore.Test/Utilities/WindowsOnlyTestMethod.cs
+++ b/FFMpegCore.Test/Utilities/WindowsOnlyTestMethod.cs
@@ -7,7 +7,7 @@ public class WindowsOnlyTestMethod : TestMethodAttribute
 {
     public override TestResult[] Execute(ITestMethod testMethod)
     {
-        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+        if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
         {
             var message = $"Test not executed on other platforms than Windows";
             {