diff --git a/libraries/AC_Fence/AC_Fence.h b/libraries/AC_Fence/AC_Fence.h
index 305233e38a..f014fdd58f 100644
--- a/libraries/AC_Fence/AC_Fence.h
+++ b/libraries/AC_Fence/AC_Fence.h
@@ -19,7 +19,7 @@
 
 // default boundaries
 #define AC_FENCE_ALT_MAX_DEFAULT                    100.0f  // default max altitude is 100m
-#define AC_FENCE_CIRCLE_RADIUS_DEFAULT              150.0f  // default circular fence radius is 150m
+#define AC_FENCE_CIRCLE_RADIUS_DEFAULT              300.0f  // default circular fence radius is 300m
 #define AC_FENCE_ALT_MAX_BACKUP_DISTANCE            20.0f   // after fence is broken we recreate the fence 20m further up
 #define AC_FENCE_CIRCLE_RADIUS_BACKUP_DISTANCE      20.0f   // after fence is broken we recreate the fence 20m further out
 #define AC_FENCE_MARGIN_DEFAULT                     2.0f    // default distance in meters that autopilot's should maintain from the fence to avoid a breach