diff --git a/Contrib/Modern UI/System.nsh b/Contrib/Modern UI/System.nsh
index 3f42bc43..8ead1c75 100644
--- a/Contrib/Modern UI/System.nsh	
+++ b/Contrib/Modern UI/System.nsh	
@@ -1600,19 +1600,19 @@
   Function "${PRE}"
     !insertmacro MUI_HEADER_TEXT $(un.MUI_UNTEXT_INTRO_TITLE) $(un.MUI_UNTEXT_INTRO_SUBTITLE)
     !ifdef MUI_UNCUSTOMFUNCTION_CONFIRM_PRE
-      Call "{MUI_UNCUSTOMFUNCTION_CONFIRM_PRE}"
+      Call "${MUI_UNCUSTOMFUNCTION_CONFIRM_PRE}"
     !endif
   FunctionEnd
   
   Function "${SHOW}"
     !ifdef MUI_UNCUSTOMFUNCTION_CONFIRM_SHOW
-      Call "{MUI_UNCUSTOMFUNCTION_CONFIRM_SHOW}"
+      Call "${MUI_UNCUSTOMFUNCTION_CONFIRM_SHOW}"
     !endif
   FunctionEnd
   
   Function "${LEAVE}"
     !ifdef MUI_UNCUSTOMFUNCTION_CONFIRM_LEAVE
-      Call "{MUI_UNCUSTOMFUNCTION_CONFIRM_LEAVE}"
+      Call "${MUI_UNCUSTOMFUNCTION_CONFIRM_LEAVE}"
     !endif
   FunctionEnd
   
@@ -1635,19 +1635,19 @@
   Function ${PRE}
     !insertmacro MUI_HEADER_TEXT $(un.MUI_UNTEXT_UNINSTALLING_TITLE) $(un.MUI_UNTEXT_UNINSTALLING_SUBTITLE)
     !ifdef MUI_UNCUSTOMFUNCTION_INSTFILES_PRE
-      Call "{MUI_UNCUSTOMFUNCTION_INSTFILES_PRE}"
+      Call "${MUI_UNCUSTOMFUNCTION_INSTFILES_PRE}"
     !endif
   FunctionEnd
 
   Function "${SHOW}"
     !ifdef MUI_UNCUSTOMFUNCTION_INSTFILES_SHOW
-      Call "{MUI_UNCUSTOMFUNCTION_INSTFILES_SHOW}"
+      Call "${MUI_UNCUSTOMFUNCTION_INSTFILES_SHOW}"
     !endif
   FunctionEnd
   
   Function "${LEAVE}"
     !ifdef MUI_UNCUSTOMFUNCTION_INSTFILES_LEAVE
-      Call "{MUI_UNCUSTOMFUNCTION_INSTFILES_LEAVE}"
+      Call "${MUI_UNCUSTOMFUNCTION_INSTFILES_LEAVE}"
     !endif
   FunctionEnd