diff --git a/simgear/nasal/gc.c b/simgear/nasal/gc.c
index ee209527..b43b584e 100644
--- a/simgear/nasal/gc.c
+++ b/simgear/nasal/gc.c
@@ -123,7 +123,9 @@ static void naCode_gcclean(struct naCode* o)
     naFree(o->byteCode);   o->byteCode = 0;
     naFree(o->constants);  o->constants = 0;
     naFree(o->argSyms);    o->argSyms = 0;
-    naFree(o->optArgSyms); o->argSyms = 0;
+    naFree(o->optArgSyms); o->optArgSyms = 0;
+    naFree(o->optArgVals); o->optArgVals = 0;
+    naFree(o->lineIps);    o->lineIps = 0;
 }
 
 static void naGhost_gcclean(struct naGhost* g)