diff --git a/Contrib/MultiUser/MultiUser.nsh b/Contrib/MultiUser/MultiUser.nsh
index 34ff213d..38cb5e31 100644
--- a/Contrib/MultiUser/MultiUser.nsh
+++ b/Contrib/MultiUser/MultiUser.nsh
@@ -102,7 +102,7 @@ Install modes
   
     !endif
   
-    !ifdef "${MULTIUSER_INSTALLMODE_${UNINSTALLER_PREFIX}FUNCTION}"
+    !ifdef MULTIUSER_INSTALLMODE_${UNINSTALLER_PREFIX}FUNCTION
       Call "${MULTIUSER_INSTALLMODE_${UNINSTALLER_PREFIX}FUNCTION}"
     !endif
     
@@ -138,7 +138,7 @@ Install modes
   
     !endif
   
-    !ifdef "${MULTIUSER_INSTALLMODE_${UNINSTALLER_PREFIX}FUNCTION}"
+    !ifdef MULTIUSER_INSTALLMODE_${UNINSTALLER_PREFIX}FUNCTION
       Call "${MULTIUSER_INSTALLMODE_${UNINSTALLER_PREFIX}FUNCTION}"
     !endif