diff --git a/bin/check/check-tool.c b/bin/check/check-tool.c
index 8d841cd758..f0db14c771 100644
--- a/bin/check/check-tool.c
+++ b/bin/check/check-tool.c
@@ -53,14 +53,16 @@
 #define CHECK_LOCAL 1
 #endif /* ifndef CHECK_LOCAL */
 
-#define ERR_IS_CNAME	   1
-#define ERR_NO_ADDRESSES   2
-#define ERR_LOOKUP_FAILURE 3
-#define ERR_EXTRA_A	   4
-#define ERR_EXTRA_AAAA	   5
-#define ERR_MISSING_GLUE   5
-#define ERR_IS_MXCNAME	   6
-#define ERR_IS_SRVCNAME	   7
+enum {
+	ERR_IS_CNAME = 1,
+	ERR_NO_ADDRESSES,
+	ERR_LOOKUP_FAILURE,
+	ERR_EXTRA_A,
+	ERR_EXTRA_AAAA,
+	ERR_MISSING_GLUE,
+	ERR_IS_MXCNAME,
+	ERR_IS_SRVCNAME,
+};
 
 static const char *dbtype[] = { ZONEDB_DEFAULT };