diff --git a/src/modules/mavlink/mavlink_timesync.cpp b/src/modules/mavlink/mavlink_timesync.cpp
index 53ec811587..41c23a3068 100644
--- a/src/modules/mavlink/mavlink_timesync.cpp
+++ b/src/modules/mavlink/mavlink_timesync.cpp
@@ -107,7 +107,7 @@ MavlinkTimesync::handle_message(const mavlink_message_t *msg)
 						// Filter gain scheduling
 						if (!sync_converged()) {
 							// Interpolate with a sigmoid function
-							double progress = _sequence / CONVERGENCE_WINDOW;
+							double progress = (double)_sequence / (double)CONVERGENCE_WINDOW;
 							double p = 1.0 - exp(0.5 * (1.0 - 1.0 / (1.0 - progress)));
 							_filter_alpha = p * ALPHA_GAIN_FINAL + (1.0 - p) * ALPHA_GAIN_INITIAL;
 							_filter_beta = p * BETA_GAIN_FINAL + (1.0 - p) * BETA_GAIN_INITIAL;