diff --git a/lib/cgraph/id.c b/lib/cgraph/id.c
index 694220ef39d41ff7c085892bd55436e42ec3c3c2..c37c7e590ec3840d77865a825ac56161fad132aa 100644
--- a/lib/cgraph/id.c
+++ b/lib/cgraph/id.c
@@ -138,7 +138,6 @@ void agfreeid(Agraph_t * g, int objtype, IDTYPE id)
  * Return string representation of object.
  * In general, returns the name of node or graph,
  * and the key of an edge. If edge is anonymous, returns NULL.
- * Uses static buffer for anonymous graphs.
  */
 char *agnameof(void *obj)
 {
@@ -158,7 +157,7 @@ char *agnameof(void *obj)
     }
     if (AGTYPE(obj) != AGEDGE) {
 	sprintf(buf, "%c%ld", LOCALNAMEPREFIX, AGID(obj));
-	rv = buf;
+	rv = agstrdup(g, buf);
     }
     else
 	rv = 0;