diff --git a/libraries/AP_Common/AP_Common.h b/libraries/AP_Common/AP_Common.h
index 7d96284239..c7004569d2 100644
--- a/libraries/AP_Common/AP_Common.h
+++ b/libraries/AP_Common/AP_Common.h
@@ -89,7 +89,7 @@
 #define ARRAY_SIZE(_arr) (sizeof(_arr) / sizeof(_arr[0]))
 
 #define UINT16_VALUE(hbyte, lbyte) (static_cast<uint16_t>(((hbyte)<<8)|(lbyte)))
-#define UINT32_VALUE(b3, b2, b1, b0) (static_cast<uint32_t>(((b3)<<23)|((b2)<<16)|((b1)<<8)|(b0)))
+#define UINT32_VALUE(b3, b2, b1, b0) (static_cast<uint32_t>(((b3)<<24)|((b2)<<16)|((b1)<<8)|(b0)))
 
 /*
  * See UNUSED_RESULT. The difference is that it receives @uniq_ as the name to