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-rw-r--r--src/state.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/state.c b/src/state.c
index ac9f88088..dc5a1481f 100644
--- a/src/state.c
+++ b/src/state.c
@@ -29,7 +29,7 @@ mrb_open_allocf(mrb_allocf f, void *ud)
mrb_state *mrb;
#ifdef MRB_NAN_BOXING
- mrb_assert(sizeof(void*) == 4);
+ mrb_static_assert(sizeof(void*) == 4, "when using NaN boxing sizeof pointer must be 4 byte");
#endif
mrb = (mrb_state *)(f)(NULL, NULL, sizeof(mrb_state), ud);