diff --git a/insns.def b/insns.def
index 43690be52e..7dfeed202b 100644
--- a/insns.def
+++ b/insns.def
@@ -526,11 +526,13 @@ newhash
 {
     RUBY_DTRACE_CREATE_HOOK(HASH, num);
 
-    val = rb_hash_new_with_size(num / 2);
-
     if (num) {
+        val = rb_hash_new_with_size(num / 2);
         rb_hash_bulk_insert(num, STACK_ADDR_FROM_TOP(num), val);
     }
+    else {
+        val = rb_hash_new();
+    }
 }
 
 /* put new Range object.(Range.new(low, high, flag)) */