diff --git a/range.h b/range.h
index 6c96015..7b1f010 100644
--- a/range.h
+++ b/range.h
@@ -1,18 +1,22 @@
 #ifndef _RANGE_H
 #define _RANGE_H
 
+#ifndef MIN
 #define MIN(a, b)                                                              \
 	({                                                                     \
 		typeof(a) _a = a;                                              \
 		typeof(b) _b = b;                                              \
 		_a < _b ? _a : _b;                                             \
 	})
+#endif
 
+#ifndef MAX
 #define MAX(a, b)                                                              \
 	({                                                                     \
 		typeof(a) _a = a;                                              \
 		typeof(b) _b = b;                                              \
 		_a > _b ? _a : _b;                                             \
 	})
+#endif
 
 #endif