diff --git a/src/common/url.c b/src/common/url.c
index 1f3277cd..89047511 100644
--- a/src/common/url.c
+++ b/src/common/url.c
@@ -333,7 +333,7 @@ do_an_re(const char *word,int *start, int *end, int *type)
 }
 
 /*	Miscellaneous description --- */
-#define DOMAIN "[-a-z0-9]+(\\.[-a-z0-9]+)*\\."
+#define DOMAIN "[a-z0-9][-a-z0-9]*(\\.[-a-z0-9]+)*\\."
 #define TLD "[a-z][-a-z0-9]*[a-z]"
 #define IPADDR "[0-9]+(\\.[0-9]+){3}"
 #define HOST "(" DOMAIN TLD "|" IPADDR ")"