diff --git a/test/functions.source b/test/functions.source
index 38c9a8d0..e22841d8 100644
--- a/test/functions.source
+++ b/test/functions.source
@@ -471,9 +471,8 @@ prepareTest()
 				fi
 				args+=($i)
 			done
-			DIFF=$(readlink -f "$here/../msvc2003/diff$exe")
-			chmod +x "$DIFF"
-			         "$DIFF" ${args[@]}
+			DIFF=$(which diff)
+			"$DIFF" ${args[@]}
 		}
 	fi