diff --git a/debugger/stabs.c b/debugger/stabs.c
index 8fb9c96f847..3f8e6d36763 100644
--- a/debugger/stabs.c
+++ b/debugger/stabs.c
@@ -162,6 +162,7 @@ DEBUG_FileSubNr2StabEnum(int filenr,int subnr) {
 	stab_types = (struct datatype **) xrealloc(stab_types, 
 		    num_stab_types * sizeof(struct datatype *)
 	);
+        memset( stab_types + curtypenum, 0, sizeof(struct datatype *) * (num_stab_types - curtypenum) );
     }
     //fprintf(stderr,"(%d,%d) is %d\n",filenr,subnr,typenums[filenr][subnr]);
     return typenums[filenr][subnr];