diff --git a/Library/OcStringLib/OcUnicodeLib.c b/Library/OcStringLib/OcUnicodeLib.c
index be39321e..1c24422c 100755
--- a/Library/OcStringLib/OcUnicodeLib.c
+++ b/Library/OcStringLib/OcUnicodeLib.c
@@ -230,7 +230,7 @@ UnicodeGetParentDirectory (
   //
   // Drop trailing slash when getting a directory.
   //
-  if (String[Length - 1] == '\\' && String[Length - 1] == '/') {
+  if (String[Length - 1] == '\\' || String[Length - 1] == '/') {
     --Length;
     //
     // Paths with just one slash have no root directory (e.g. \\/).