diff --git a/lib/warnless.c b/lib/warnless.c
index f19bbe398df5e95ef5ead0dbd94251a445b1b928..4f42dd07ff5a13551601ab12c8bb3816601cb0af 100644
--- a/lib/warnless.c
+++ b/lib/warnless.c
@@ -59,13 +59,13 @@
 #if (CURL_SIZEOF_LONG == 2)
 #  define CURL_MASK_SLONG  0x7FFFL
 #  define CURL_MASK_ULONG  0xFFFFUL
-#elif (SIZEOF_LONG == 4)
+#elif (CURL_SIZEOF_LONG == 4)
 #  define CURL_MASK_SLONG  0x7FFFFFFFL
 #  define CURL_MASK_ULONG  0xFFFFFFFFUL
-#elif (SIZEOF_LONG == 8)
+#elif (CURL_SIZEOF_LONG == 8)
 #  define CURL_MASK_SLONG  0x7FFFFFFFFFFFFFFFL
 #  define CURL_MASK_ULONG  0xFFFFFFFFFFFFFFFFUL
-#elif (SIZEOF_LONG == 16)
+#elif (CURL_SIZEOF_LONG == 16)
 #  define CURL_MASK_SLONG  0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFL
 #  define CURL_MASK_ULONG  0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFUL
 #else