diff --git a/ArduPlane/Attitude.cpp b/ArduPlane/Attitude.cpp
index 17cc78bc17397..d56db22d70abb 100644
--- a/ArduPlane/Attitude.cpp
+++ b/ArduPlane/Attitude.cpp
@@ -657,7 +657,7 @@ void Plane::update_load_factor(void)
     }
 #endif
 
-    float max_load_factor = smoothed_airspeed / MAX(aparm.airspeed_min, 1);
+    float max_load_factor = sq(smoothed_airspeed / MAX(aparm.airspeed_min, 1));
     if (max_load_factor <= 1) {
         // our airspeed is below the minimum airspeed. Limit roll to
         // 25 degrees
@@ -668,13 +668,13 @@ void Plane::update_load_factor(void)
         // load limit. Limit our roll to a bank angle that will keep
         // the load within what the airframe can handle. We always
         // allow at least 25 degrees of roll however, to ensure the
-        // aircraft can be manoeuvred with a bad airspeed estimate. At
+        // aircraft can be manoeuvered with a bad airspeed estimate. At
         // 25 degrees the load factor is 1.1 (10%)
-        int32_t roll_limit = degrees(acosf(sq(1.0f / max_load_factor)))*100;
+        int32_t roll_limit = degrees(acosf(1.0f / max_load_factor))*100;
         if (roll_limit < 2500) {
             roll_limit = 2500;
         }
         nav_roll_cd = constrain_int32(nav_roll_cd, -roll_limit, roll_limit);
         roll_limit_cd = MIN(roll_limit_cd, roll_limit);
-    }    
+    }
 }