Index: trunk/src/libcschem/compile.c
===================================================================
--- trunk/src/libcschem/compile.c	(revision 10278)
+++ trunk/src/libcschem/compile.c	(revision 10279)
@@ -63,6 +63,7 @@
 
 	if (key[0] == '-') {
 		if (dsta_out != NULL) *dsta_out = NULL;
+		csch_attr_src_free(src);
 		return 0;
 	}
 
@@ -97,6 +98,7 @@
 					/* both set, same value, remember lowest prio */
 					if (srca->prio >= dsta->prio) {
 						csch_attrib_append_src(dsta, srca->prio, src, 1);
+						csch_attr_src_free(src);
 						return 0; /* ignore new */
 					}
 				}
@@ -104,6 +106,7 @@
 					/* different values, look at prios */
 					if (srca->prio > dsta->prio) {
 						csch_attrib_append_src(dsta, srca->prio, src, 1);
+						csch_attr_src_free(src);
 						return 0; /* lower prio, ignore */
 					}
 					if (srca->prio == dsta->prio) {