diff --git a/tools/qfcc/include/expr.h b/tools/qfcc/include/expr.h
index b25481a8f..0efc998ba 100644
--- a/tools/qfcc/include/expr.h
+++ b/tools/qfcc/include/expr.h
@@ -104,6 +104,7 @@ typedef struct {
 	struct expr_s **tail;	///< last expression in the block, for appending
 	struct expr_s *result;	///< the result of this block if non-void
 	int         is_call;	///< this block exprssion forms a function call
+	void       *return_addr;///< who allocated this
 } ex_block_t;
 
 typedef struct {
diff --git a/tools/qfcc/source/expr.c b/tools/qfcc/source/expr.c
index 85c07511b..734886f9a 100644
--- a/tools/qfcc/source/expr.c
+++ b/tools/qfcc/source/expr.c
@@ -561,6 +561,7 @@ new_block_expr (void)
 	b->type = ex_block;
 	b->e.block.head = 0;
 	b->e.block.tail = &b->e.block.head;
+	b->e.block.return_addr = __builtin_return_address (0);
 	return b;
 }