diff --git a/dlls/serialui/serialui.spec b/dlls/serialui/serialui.spec
index 7be42ae577c..b5e92bb9676 100644
--- a/dlls/serialui/serialui.spec
+++ b/dlls/serialui/serialui.spec
@@ -1,6 +1,6 @@
 1 stdcall EnumPropPages(ptr ptr long)
-2 stdcall drvCommConfigDialogW(ptr long ptr)
-3 stdcall drvCommConfigDialogA(ptr long ptr)
+2 stdcall drvCommConfigDialogW(wstr long ptr)
+3 stdcall drvCommConfigDialogA(str long ptr)
 4 stdcall drvSetDefaultCommConfigW(wstr ptr long)
 5 stdcall drvSetDefaultCommConfigA(str ptr long)
 6 stdcall drvGetDefaultCommConfigW(wstr ptr ptr)