diff --git a/src/drivers/heater/heater.cpp b/src/drivers/heater/heater.cpp
index 170bd859a4..aba6f7066e 100644
--- a/src/drivers/heater/heater.cpp
+++ b/src/drivers/heater/heater.cpp
@@ -231,7 +231,7 @@ void Heater::Run()
 
 		_controller_time_on_usec = math::constrain(_controller_time_on_usec, 0, _controller_period_usec);
 
-		if (abs(temperature_delta) < TEMPERATURE_TARGET_THRESHOLD) {
+		if (fabsf(temperature_delta) < TEMPERATURE_TARGET_THRESHOLD) {
 			_temperature_target_met = true;
 
 		} else {
diff --git a/src/drivers/telemetry/hott/messages.cpp b/src/drivers/telemetry/hott/messages.cpp
index 150bc21fe9..f800a00566 100644
--- a/src/drivers/telemetry/hott/messages.cpp
+++ b/src/drivers/telemetry/hott/messages.cpp
@@ -249,7 +249,7 @@ build_gps_response(uint8_t *buffer, size_t *size)
 
 		if (lat < 0) {
 			msg.latitude_ns = 1;
-			lat = abs(lat);
+			lat = fabs(lat);
 		}
 
 		int deg;
diff --git a/src/modules/navigator/GeofenceBreachAvoidance/geofence_breach_avoidance.cpp b/src/modules/navigator/GeofenceBreachAvoidance/geofence_breach_avoidance.cpp
index f84e24e74b..802dacaaf6 100644
--- a/src/modules/navigator/GeofenceBreachAvoidance/geofence_breach_avoidance.cpp
+++ b/src/modules/navigator/GeofenceBreachAvoidance/geofence_breach_avoidance.cpp
@@ -159,7 +159,7 @@ GeofenceBreachAvoidance::generateLoiterPointForMultirotor(geofence_violation_typ
 		Vector2d test_point;
 
 		// binary search for the distance from the drone to the geofence in the given direction
-		while (abs(current_max - current_min) > 0.5f) {
+		while (fabsf(current_max - current_min) > 0.5f) {
 			test_point = waypointFromBearingAndDistance(_current_pos_lat_lon, _test_point_bearing, current_distance);
 
 			if (!geofence->isInsidePolygonOrCircle(test_point(0), test_point(1), _current_alt_amsl)) {