diff --git a/Source/PascalScript.inc b/Source/PascalScript.inc
index 776886e..b28c9ad 100644
--- a/Source/PascalScript.inc
+++ b/Source/PascalScript.inc
@@ -61,14 +61,14 @@ Defines:
   {$DEFINE PS_HAVEVARIANT}
   {$DEFINE PS_DYNARRAY}
   {$DEFINE PS_NOIDISPATCH}
-{$if (fpc_version=2) and (fpc_release>=3) and (fpc_patch>=1)}
-  {$UNDEF FPC_OLD_FIX}
-  {$UNDEF PS_FPCSTRINGWORKAROUND}
+  {$if defined(fpc_version) and defined(fpc_patch) and defined(fpc_release) and (fpc_version=2) and (fpc_release>=3) and (fpc_patch>=1)}
+    {$UNDEF FPC_OLD_FIX}
+    {$UNDEF PS_FPCSTRINGWORKAROUND}
   {FreePascal 2.3.1 and above has much Delphi compatibility bugs fixed}
-{$else}
-  {$DEFINE FPC_OLD_FIX}
-  {$DEFINE PS_FPCSTRINGWORKAROUND}
-{$endif}
+  {$else}
+    {$DEFINE FPC_OLD_FIX}
+    {$DEFINE PS_FPCSTRINGWORKAROUND}
+  {$ifend}
   {$DEFINE DELPHI3UP}
   {$DEFINE DELPHI6UP}
 {$ENDIF}