diff --git a/qjs.c b/qjs.c
index d56b843..c2d63e9 100644
--- a/qjs.c
+++ b/qjs.c
@@ -454,8 +454,10 @@ int main(int argc, char **argv)
         }
     }
 
+#ifdef CONFIG_BIGNUM
     if (load_jscalc)
         bignum_ext = 1;
+#endif
 
     if (trace_memory) {
         js_trace_malloc_init(&trace_data);