diff --git a/src/message.c b/src/message.c
index 0bbd87f..8508f6d 100644
--- a/src/message.c
+++ b/src/message.c
@@ -4376,7 +4376,7 @@
 		    {
 			/* Don't put the #if inside memchr(), it can be a
 			 * macro. */
-#if SIZEOF_INT <= 2
+#if VIM_SIZEOF_INT <= 2
 			char *q = memchr(str_arg, '\0', precision);
 #else
 			/* memchr on HP does not like n > 2^31  !!! */