diff --git a/runtime/include/types.h b/runtime/include/types.h
index d021c1f..74e1f58 100644
--- a/runtime/include/types.h
+++ b/runtime/include/types.h
@@ -39,7 +39,6 @@
 typedef signed char   i8;
 typedef unsigned char u8;
 typedef int16_t       i16;
-typedef uint16_t      u16;
 
 /* FIXME: per-module configuration? */
 #define WASM_PAGE_SIZE   (1024 * 64) /* 64KB */