diff --git a/mrbgems/mruby-struct/src/struct.c b/mrbgems/mruby-struct/src/struct.c
index f0d3d5edc..72e4e64bb 100644
--- a/mrbgems/mruby-struct/src/struct.c
+++ b/mrbgems/mruby-struct/src/struct.c
@@ -524,7 +524,9 @@ mrb_struct_equal(mrb_state *mrb, mrb_value s)
   if (mrb_obj_class(mrb, s) != mrb_obj_class(mrb, s2)) {
     return mrb_false_value();
   }
-  mrb_assert(RSTRUCT_LEN(s) == RSTRUCT_LEN(s2));
+  if (RSTRUCT_LEN(s) != RSTRUCT_LEN(s2)) {
+    return mrb_false_value();
+  }
   ptr = RSTRUCT_PTR(s);
   ptr2 = RSTRUCT_PTR(s2);
   len = RSTRUCT_LEN(s);
@@ -558,7 +560,9 @@ mrb_struct_eql(mrb_state *mrb, mrb_value s)
   if (mrb_obj_class(mrb, s) != mrb_obj_class(mrb, s2)) {
     return mrb_false_value();
   }
-  mrb_assert(RSTRUCT_LEN(s) == RSTRUCT_LEN(s2));
+  if (RSTRUCT_LEN(s) != RSTRUCT_LEN(s2)) {
+    return mrb_false_value();
+  }
   ptr = RSTRUCT_PTR(s);
   ptr2 = RSTRUCT_PTR(s2);
   len = RSTRUCT_LEN(s);