diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index 4365100b37..7321a77b61 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -1075,7 +1075,7 @@ static void medium_loop()
         medium_loopCounter++;
 
         // log compass information
-        if (motors.armed() && g.log_bitmask & MASK_LOG_COMPASS) {
+        if (motors.armed() && (g.log_bitmask & MASK_LOG_COMPASS)) {
             Log_Write_Compass();
         }
 
@@ -1097,7 +1097,7 @@ static void medium_loop()
         // perform next command
         // --------------------
         if(control_mode == AUTO) {
-            if(ap.home_is_set && g.command_total > 1) {
+            if(ap.home_is_set && (g.command_total > 1)) {
                 update_commands();
             }
         }
diff --git a/ArduCopter/commands.pde b/ArduCopter/commands.pde
index c5635fe84f..d799e7003a 100644
--- a/ArduCopter/commands.pde
+++ b/ArduCopter/commands.pde
@@ -50,7 +50,7 @@ static struct Location get_cmd_with_index(int i)
     }
 
     // Add on home altitude if we are a nav command (or other command with altitude) and stored alt is relative
-    //if((temp.id < MAV_CMD_NAV_LAST || temp.id == MAV_CMD_CONDITION_CHANGE_ALT) && temp.options & MASK_OPTIONS_RELATIVE_ALT){
+    //if((temp.id < MAV_CMD_NAV_LAST || temp.id == MAV_CMD_CONDITION_CHANGE_ALT) && (temp.options & MASK_OPTIONS_RELATIVE_ALT)){
     //temp.alt += home.alt;
     //}
 
diff --git a/ArduCopter/inertia.pde b/ArduCopter/inertia.pde
index ce951fbb0a..7b65532082 100644
--- a/ArduCopter/inertia.pde
+++ b/ArduCopter/inertia.pde
@@ -8,7 +8,7 @@ static void read_inertia()
     // inertial altitude estimates
     inertial_nav.update(G_Dt);
 
-    if( motors.armed() && g.log_bitmask & MASK_LOG_INAV ) {
+    if( motors.armed() && (g.log_bitmask & MASK_LOG_INAV) ) {
         log_counter_inav++;
         if( log_counter_inav >= 10 ) {
             log_counter_inav = 0;
@@ -23,4 +23,4 @@ static void read_inertial_altitude()
     // with inertial nav we can update the altitude and climb rate at 50hz
     current_loc.alt = inertial_nav.get_altitude();
     climb_rate = inertial_nav.get_velocity_z();
-}
\ No newline at end of file
+}
diff --git a/ArduCopter/navigation.pde b/ArduCopter/navigation.pde
index 1c7d560aa5..3cc4c43b3e 100644
--- a/ArduCopter/navigation.pde
+++ b/ArduCopter/navigation.pde
@@ -20,7 +20,7 @@ static void update_navigation()
         update_nav_mode();
 
         // update log
-        if (g.log_bitmask & MASK_LOG_NTUN && motors.armed()) {
+        if ((g.log_bitmask & MASK_LOG_NTUN) && motors.armed()) {
             Log_Write_Nav_Tuning();
         }
     }