diff --git a/include/common/standard.h b/include/common/standard.h
index 4ba6a950c..7de8ead28 100644
--- a/include/common/standard.h
+++ b/include/common/standard.h
@@ -371,7 +371,7 @@ struct sockaddr_storage *str2sa_range(const char *str,
 
 /* converts <str> to a struct in_addr containing a network mask. It can be
  * passed in dotted form (255.255.255.0) or in CIDR form (24). It returns 1
- * if the conversion succeeds otherwise non-zero.
+ * if the conversion succeeds otherwise zero.
  */
 int str2mask(const char *str, struct in_addr *mask);
 
diff --git a/src/standard.c b/src/standard.c
index 6abedb4a2..95d83e49c 100644
--- a/src/standard.c
+++ b/src/standard.c
@@ -1007,7 +1007,7 @@ struct sockaddr_storage *str2sa_range(const char *str, int *port, int *low, int
 
 /* converts <str> to a struct in_addr containing a network mask. It can be
  * passed in dotted form (255.255.255.0) or in CIDR form (24). It returns 1
- * if the conversion succeeds otherwise non-zero.
+ * if the conversion succeeds otherwise zero.
  */
 int str2mask(const char *str, struct in_addr *mask)
 {