diff --git a/include/socks/compiler.h b/include/socks/compiler.h
index 305afb2..dd00c2e 100644
--- a/include/socks/compiler.h
+++ b/include/socks/compiler.h
@@ -1,8 +1,8 @@
 #ifndef SOCKS_COMPILER_H_
 #define SOCKS_COMPILER_H_
 
-#define READ_ONCE(p) (*((const volatile typeof(p) *)&(p)))
-#define WRITE_ONCE(p, v) *(volatile typeof(p) *)&(p) = (v)
+#define READ_ONCE(t, p) (*((const volatile t *)&(p)))
+#define WRITE_ONCE(t, p, v) *(volatile t *)&(p) = (v)
 
 #undef __used
 #define __used __attribute__((used))