diff --git a/libraries/AC_Fence/AC_Fence.cpp b/libraries/AC_Fence/AC_Fence.cpp
index 04a238196f58fe..20dbecfb85a733 100644
--- a/libraries/AC_Fence/AC_Fence.cpp
+++ b/libraries/AC_Fence/AC_Fence.cpp
@@ -359,7 +359,7 @@ bool AC_Fence::pre_arm_check(const char* &fail_msg) const
 
     // check no limits are currently breached
     if (_breached_fences) {
-        fail_msg =  "vehicle outside fence";
+        fail_msg =  "Vehicle breaching fence";
         return false;
     }