diff --git a/modules/m_who.c b/modules/m_who.c
index 2175fcc..b5357e7 100644
--- a/modules/m_who.c
+++ b/modules/m_who.c
@@ -102,6 +102,7 @@ m_who(struct Client *client_p, struct Client *source_p, int parc, const char *pa
 	int operspy = 0;
 	struct who_format fmt;
 	const char *s;
+	char maskcopy[512];
 
 	fmt.fields = 0;
 	fmt.querytype = NULL;
@@ -137,7 +138,8 @@ m_who(struct Client *client_p, struct Client *source_p, int parc, const char *pa
 			fmt.querytype = "0";
 	}
 
-	mask = LOCAL_COPY(parv[1]);
+	strlcpy(maskcopy, parv[1], sizeof maskcopy);
+	mask = maskcopy;
 
 	collapse(mask);