diff --git a/vm/gc.cpp b/vm/gc.cpp
index 22c851378c..0de3dac91f 100755
--- a/vm/gc.cpp
+++ b/vm/gc.cpp
@@ -230,7 +230,7 @@ struct call_frame_scrubber {
 		gc_info *info = compiled->block_gc_info();
 
 		assert(return_address < compiled->size());
-		cell index = info->return_address_index(return_address);
+		int index = info->return_address_index(return_address);
 		if(index != -1)
 			ctx->scrub_stacks(info,index);
 	}
diff --git a/vm/slot_visitor.hpp b/vm/slot_visitor.hpp
index b97f988e65..303fc37544 100755
--- a/vm/slot_visitor.hpp
+++ b/vm/slot_visitor.hpp
@@ -292,7 +292,7 @@ struct call_frame_slot_visitor {
 		gc_info *info = compiled->block_gc_info();
 
 		assert(return_address < compiled->size());
-		cell callsite = info->return_address_index(return_address);
+		u32 callsite = info->return_address_index(return_address);
 		if(callsite == gc_info_missing_value)
 			return;