diff --git a/settings.c b/settings.c
index 3497304..a99fe25 100644
--- a/settings.c
+++ b/settings.c
@@ -52,7 +52,7 @@ typedef struct {
 #define DEFAULT_FEEDRATE 500.0
 #define DEFAULT_ACCELERATION (DEFAULT_FEEDRATE/10.0)
 #define DEFAULT_MAX_JERK 300.0
-#define DEFAULT_STEPPING_INVERT_MASK ((1<<X_STEP_BIT)|(1<<Y_STEP_BIT)||(1<<Z_STEP_BIT))
+#define DEFAULT_STEPPING_INVERT_MASK ((1<<X_STEP_BIT)|(1<<Y_STEP_BIT)|(1<<Z_STEP_BIT))
 
 void settings_reset() {
   settings.steps_per_mm[X_AXIS] = DEFAULT_X_STEPS_PER_MM;