diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 888ce89169..ca794bcaeb 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -434,6 +434,13 @@ __extension__({ \
     RUBY__ASAN_DEFAULT_OPTIONS \
     /* RUBY_GLOBAL_SETUP end */
 
+#if defined(__wasm__) && !defined(__EMSCRIPTEN__)
+int rb_wasm_rt_start(int (*)(int, char **), int, char **);
+# define ruby_start_main rb_wasm_rt_start
+#else
+# define ruby_start_main(main, argc, argv) main(argc, argv)
+#endif
+
 RBIMPL_SYMBOL_EXPORT_END()
 
 #endif /* RUBY_RUBY_H */
diff --git a/main.c b/main.c
index 35efcde175..525189db85 100644
--- a/main.c
+++ b/main.c
@@ -42,11 +42,6 @@ rb_main(int argc, char **argv)
     return ruby_run_node(ruby_options(argc, argv));
 }
 
-#if defined(__wasm__) && !defined(__EMSCRIPTEN__)
-int rb_wasm_rt_start(int (main)(int argc, char **argv), int argc, char **argv);
-#define rb_main(argc, argv) rb_wasm_rt_start(rb_main, argc, argv)
-#endif
-
 #ifdef _WIN32
 #define main(argc, argv) w32_main(argc, argv)
 static int main(int argc, char **argv);
@@ -64,5 +59,5 @@ main(int argc, char **argv)
 #endif
 
     ruby_sysinit(&argc, &argv);
-    return rb_main(argc, argv);
+    return ruby_start_main(rb_main, argc, argv);
 }