diff --git a/EKF/common.h b/EKF/common.h
index f32e35da57..b31fc69c83 100644
--- a/EKF/common.h
+++ b/EKF/common.h
@@ -361,7 +361,7 @@ struct parameters {
 
 	// compute synthetic magnetomter Z value if possible
 	int32_t synthesize_mag_z{0};
-	bool check_mag_strength{false};
+	int32_t check_mag_strength{0};
 };
 
 struct stateSample {