diff --git a/main/utils.c b/main/utils.c
index e85618048c..9a54622a96 100644
--- a/main/utils.c
+++ b/main/utils.c
@@ -212,7 +212,7 @@ struct hostent *ast_gethostbyname(const char *host, struct ast_hostent *hp)
 		return NULL;
 		
 	}
-#ifdef HAVE_GETHOSTBYNAME_R5
+#ifdef HAVE_GETHOSTBYNAME_R_5
 	result = gethostbyname_r(host, &hp->hp, hp->buf, sizeof(hp->buf), &herrno);
 
 	if (!result || !hp->hp.h_addr_list || !hp->hp.h_addr_list[0])