diff --git a/libraries/AP_Arming/AP_Arming.cpp b/libraries/AP_Arming/AP_Arming.cpp
index 7657467ba7..236d303fd8 100644
--- a/libraries/AP_Arming/AP_Arming.cpp
+++ b/libraries/AP_Arming/AP_Arming.cpp
@@ -329,7 +329,7 @@ bool AP_Arming::ins_checks(bool report)
         // check AHRS attitudes are consistent
         char failure_msg[50] = {};
         if (!AP::ahrs().attitudes_consistent(failure_msg, ARRAY_SIZE(failure_msg))) {
-            check_failed(ARMING_CHECK_INS, report, failure_msg);
+            check_failed(ARMING_CHECK_INS, report, "%s", failure_msg);
             return false;
         }
     }
@@ -463,7 +463,7 @@ bool AP_Arming::battery_checks(bool report)
 
         char buffer[MAVLINK_MSG_STATUSTEXT_FIELD_TEXT_LEN+1] {};
         if (!AP::battery().arming_checks(sizeof(buffer), buffer)) {
-            check_failed(ARMING_CHECK_BATTERY, report, buffer);
+            check_failed(ARMING_CHECK_BATTERY, report, "%s", buffer);
             return false;
         }
      }