diff --git a/src/EmptyFiles/FileExtensions.cs b/src/EmptyFiles/FileExtensions.cs
index 6166455..74c0d00 100644
--- a/src/EmptyFiles/FileExtensions.cs
+++ b/src/EmptyFiles/FileExtensions.cs
@@ -29,7 +29,8 @@ public static bool IsTextFile(CharSpan path)
         var extension = Path.GetExtension(path);
         return IsTextExtension(extension);
 #else
-        return IsTextExtension(path.ToString());
+        var extension = Path.GetExtension(path.ToString());
+        return IsTextExtension(extension);
 #endif
     }
 
diff --git a/src/Tests/ExtensionsTests.cs b/src/Tests/ExtensionsTests.cs
index 6ef16ef..3dfb8df 100644
--- a/src/Tests/ExtensionsTests.cs
+++ b/src/Tests/ExtensionsTests.cs
@@ -34,7 +34,6 @@ public void IsTextLegacy()
     {
 #pragma warning disable CS0618 // Type or member is obsolete
         True(FileExtensions.IsText("file.txt"));
-        True(FileExtensions.IsText("c:/path/file.txtViaConvention"));
         False(FileExtensions.IsText("file.bin"));
         True(FileExtensions.IsText("c:/file.txt"));
         False(FileExtensions.IsText("c:/file.bin"));