diff --git a/include/Runtime/w_fmod.h b/include/Runtime/w_fmod.h
new file mode 100644
index 00000000..e1c998d6
--- /dev/null
+++ b/include/Runtime/w_fmod.h
@@ -0,0 +1,14 @@
+#ifndef __W_FMOD_H__
+#define __W_FMOD_H__
+
+#ifndef __cplusplus
+extern "C" {
+#endif
+
+float fmod(float, float);
+
+#ifndef __cplusplus
+}
+#endif
+
+#endif // __W_FMOD_H__