diff --git a/ambed/main.h b/ambed/main.h
index fb13097..ab0fdc2 100644
--- a/ambed/main.h
+++ b/ambed/main.h
@@ -87,8 +87,8 @@ typedef unsigned int            uint;
 ////////////////////////////////////////////////////////////////////////////////////////
 // macros
 
-#define MIN(a,b) 				((size_t)(a) < (size_t)(b))?(a):(b)
-#define MAX(a,b) 				((size_t)(a) > (size_t)(b))?(a):(b)
+#define MIN(a,b) 				((float)(a) < (float)(b))?(a):(b)
+#define MAX(a,b) 				((a) > (b))?(a):(b)
 #define MAKEWORD(low, high)		((uint16)(((uint8)(low)) | (((uint16)((uint8)(high))) << 8)))
 #define MAKEDWORD(low, high)	((uint32)(((uint16)(low)) | (((uint32)((uint16)(high))) << 16)))
 #define LOBYTE(w)				((uint8)(uint16)(w & 0x00FF))