diff --git a/src/base.c b/src/base.c
index 3b2b229..65091a5 100644
--- a/src/base.c
+++ b/src/base.c
@@ -9,12 +9,12 @@ typedef void (^__defer_block_t)(void);
 
 static inline void __defer_exec(__defer_block_t *blk) { (*blk)(); }
 
-#define __cat_2(a, b) a##b
-#define __cat_1(a, b) __cat_2(a, b)
+#define __concat__2(a, b) a##b
+#define __concat(a, b) __concat__2(a, b)
 
 #define scope_exit \
     __attribute__((cleanup(__defer_exec), unused)) \
-    __defer_block_t __cat_1(_defer_, __LINE__) = ^
+    __defer_block_t __concat(_defer_, __LINE__) = ^
 
 #define auto __auto_type