diff --git a/shape.c b/shape.c
index 7406e74dbf..7fe21b1c58 100644
--- a/shape.c
+++ b/shape.c
@@ -806,7 +806,7 @@ shape_cache_get_iv_index(rb_shape_t *shape, ID id, attr_index_t *value)
         }
 
         /* Verify the cache is correct by checking that this instance variable
-        * does not exist in the shape tree either. */
+         * does not exist in the shape tree either. */
         RUBY_ASSERT(!shape_get_iv_index(shape, id, value));
     }