diff --git a/programs/winhlp32/macro.c b/programs/winhlp32/macro.c
index 615b687d5e2..3b89e03a2fe 100644
--- a/programs/winhlp32/macro.c
+++ b/programs/winhlp32/macro.c
@@ -804,7 +804,7 @@ static void CALLBACK MACRO_RegisterRoutine(LPCSTR dll_name, LPCSTR proc, LPCSTR
     else MACRO_Loaded = HeapReAlloc(GetProcessHeap(), 0, MACRO_Loaded, size);
     MACRO_Loaded[MACRO_NumLoaded - 1].name      = StrDup(proc); /* FIXME: never freed */
     MACRO_Loaded[MACRO_NumLoaded - 1].alias     = NULL;
-    MACRO_Loaded[MACRO_NumLoaded - 1].isBool    = 0;
+    MACRO_Loaded[MACRO_NumLoaded - 1].isBool    = FALSE;
     MACRO_Loaded[MACRO_NumLoaded - 1].arguments = StrDup(args); /* FIXME: never freed */
     MACRO_Loaded[MACRO_NumLoaded - 1].fn        = fn;
     WINE_TRACE("Added %s(%s) at %p\n", proc, args, fn);