diff --git a/Source/WinObjEx64/props/propDriverConsts.h b/Source/WinObjEx64/props/propDriverConsts.h
index eeca62d..24035f6 100644
--- a/Source/WinObjEx64/props/propDriverConsts.h
+++ b/Source/WinObjEx64/props/propDriverConsts.h
@@ -20,4 +20,4 @@
 
 #define REGEDITWNDCLASS           L"RegEdit_RegEdit"
 #define PROPDRVREGSERVICESKEY     L"\\HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Services\\%ws"
-#define PROPDRVREGSERVICESKEYLEN  sizeof(REGISTRYSERVICESKEY) - sizeof(WCHAR)
+#define PROPDRVREGSERVICESKEYLEN  sizeof(PROPDRVREGSERVICESKEY) - sizeof(WCHAR)