diff --git a/src/structs.h b/src/structs.h
index 19dc550..31889f6 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2126,6 +2126,7 @@
 				    // out_loop_stack
 	short	 var_count;	    // number of variables defined in a loop
     } out_loop[MAX_LOOP_DEPTH];
+    int		out_loop_size;	    // nr of used entries in out_loop[]
 };
 
 struct partial_S