diff --git a/packages/fcl-passrc/src/pscanner.pp b/packages/fcl-passrc/src/pscanner.pp
index d60cfe7130..c9242d8edb 100644
--- a/packages/fcl-passrc/src/pscanner.pp
+++ b/packages/fcl-passrc/src/pscanner.pp
@@ -3632,7 +3632,7 @@ begin
     DoLog(mtWarning,nMisplacedGlobalCompilerSwitch,SMisplacedGlobalCompilerSwitch,[]);
     exit;
     end;
-  P:=UpperCase(Param);
+  P:=Trim(UpperCase(Param));
   Case P of
   'FPC','DEFAULT':
     SetMode(msFpc,FPCModeSwitches,false,bsFPCMode);