diff --git a/ares/ares_gethostbyname.c b/ares/ares_gethostbyname.c
index 7a4aad6e30..336481db54 100644
--- a/ares/ares_gethostbyname.c
+++ b/ares/ares_gethostbyname.c
@@ -215,7 +215,7 @@ static int fake_hostent(const char *name, int family, ares_host_callback callbac
       const char *p;
       for (p = name; *p; p++)
         {
-          if (!isdigit(*p) && *p != '.') {
+          if (!ISDIGIT(*p) && *p != '.') {
             return 0;
           } else if (*p == '.') {
             numdots++;
diff --git a/ares/ares_process.c b/ares/ares_process.c
index 611d24d484..0a133a27fb 100644
--- a/ares/ares_process.c
+++ b/ares/ares_process.c
@@ -44,6 +44,7 @@
 #include <sys/filio.h>
 #endif
 
+#include <assert.h>
 #include <string.h>
 #include <stdlib.h>
 #include <fcntl.h>