diff --git a/EKF/common.h b/EKF/common.h
index 9c467f4030..40332488ec 100644
--- a/EKF/common.h
+++ b/EKF/common.h
@@ -259,7 +259,7 @@ struct parameters {
 	float vehicle_variance_scaler{0.0f};	// gain applied to vehicle height variance used in calculation of height above ground observation variance
 	float max_hagl_for_range_aid{5.0f};	// maximum height above ground for which we allow to use the range finder as height source (if range_aid == 1)
 	float max_vel_for_range_aid{1.0f};	// maximum ground velocity for which we allow to use the range finder as height source (if range_aid == 1)
-	int range_aid{0};			// allow switching primary height source to range finder if certian conditions are met
+	int32_t range_aid{0};			// allow switching primary height source to range finder if certian conditions are met
 	float range_aid_innov_gate{1.0f}; 		// gate size used for innovation consistency checks for range aid fusion
 
 	// vision position fusion