diff --git a/BaseTools/Source/C/Common/CommonLib.c b/BaseTools/Source/C/Common/CommonLib.c
index 4b4d02274c..aa891152bf 100644
--- a/BaseTools/Source/C/Common/CommonLib.c
+++ b/BaseTools/Source/C/Common/CommonLib.c
@@ -664,6 +664,14 @@ Returns:
       }
     } while (*PathPointer ++ != '\0');
     
+    //
+    // Convert ":\\\\" to ":\\", because it doesn't work with WINDOWS_EXTENSION_PATH.
+    //
+    if ((PathPointer = strstr (mCommonLibFullPath, ":\\\\")) != NULL) {
+      *(PathPointer + 2) = '\0';
+      strcat (mCommonLibFullPath, PathPointer + 3);
+    }
+        
     //
     // Convert "\\.\\" to "\\", because it doesn't work with WINDOWS_EXTENSION_PATH.
     //