diff --git a/UnitsNet.Tests/CustomCode/ParseTests.cs b/UnitsNet.Tests/CustomCode/ParseTests.cs
index 3fb03de1a0..44d29e7316 100644
--- a/UnitsNet.Tests/CustomCode/ParseTests.cs
+++ b/UnitsNet.Tests/CustomCode/ParseTests.cs
@@ -204,7 +204,7 @@ public void TryParseLengthUnitAbbreviationSpecialCharacters(string s)
         [InlineData("@")]
         [InlineData("#")]
         [InlineData("$")]
-        [InlineData("%")]
+        [InlineData("%%")]
         [InlineData("^")]
         [InlineData("&")]
         [InlineData("*")]
@@ -235,4 +235,4 @@ private static string AssertExceptionAndGetFullTypeName(Action code)
         }
 
     }
-}
\ No newline at end of file
+}