diff --git a/gcc/calls.c b/gcc/calls.c
index 5e4d7462e33..4d6c848bb71 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -146,7 +146,7 @@ calls_alloca (exp)
 	register tree local;
 
 	for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local))
-	  if (calls_alloca (DECL_INITIAL (local)))
+	  if (DECL_INITIAL (local) != 0 && calls_alloca (DECL_INITIAL (local)))
 	    return 1;
       }
       {