Index: trunk/src/libcschem/attrib.c
===================================================================
--- trunk/src/libcschem/attrib.c	(revision 10282)
+++ trunk/src/libcschem/attrib.c	(revision 10283)
@@ -417,7 +417,11 @@
 		csch_attrib_t *s = csch_attrib_dup(e->value);
 		csch_attrib_t *d = csch_attrib_get(dst, e->key);
 
-		if ((s != NULL) && (d != NULL) && (csch_attrib_val_eq_(s, d))) continue; /* do not merge if values are the same */
+		if ((s != NULL) && (d != NULL) && (csch_attrib_val_eq_(s, d))) {
+			/* do not merge if values are the same */
+			attr_free(s);
+			continue;
+		}
 
 		if (s->val == NULL) { /* source is an array */
 			int done = 0;
@@ -459,6 +463,8 @@
 					csch_attr_modify_str(sheet, dst_obj, s->prio, e->key, s->val, source, 1);
 				else
 					csch_attrib_set(dst, s->prio, e->key, s->val, source, NULL);
+				attr_free(s);
+				s = NULL;
 			}
 		}
 	}