diff --git a/source/m3_api_wasi.c b/source/m3_api_wasi.c
index 47cccff..e3afc34 100644
--- a/source/m3_api_wasi.c
+++ b/source/m3_api_wasi.c
@@ -860,4 +860,20 @@ _catch:
     return result;
 }
 
+
+M3Result  m3_CloseWASI  (IM3Module io_module)
+{
+	M3Result result = m3Err_none;
+
+#ifdef _WIN32
+#else
+	for (int i = 3; i < PREOPEN_CNT; i++) {
+		close (preopen[i].fd);
+		preopen[i].fd = 0;
+	}
+#endif
+	
+	return result;
+}
+
 #endif // d_m3HasWASI
diff --git a/source/m3_api_wasi.h b/source/m3_api_wasi.h
index 8b0edc2..336f870 100644
--- a/source/m3_api_wasi.h
+++ b/source/m3_api_wasi.h
@@ -20,6 +20,7 @@ typedef struct m3_wasi_context_t
 } m3_wasi_context_t;
 
 M3Result    m3_LinkWASI     (IM3Module io_module);
+M3Result	m3_CloseWASI	(IM3Module i_module);
 
 m3_wasi_context_t* m3_GetWasiContext();