diff --git a/src/drivers/gnss/septentrio/septentrio.cpp b/src/drivers/gnss/septentrio/septentrio.cpp
index a5ca8a95d1..ea77df3c8b 100644
--- a/src/drivers/gnss/septentrio/septentrio.cpp
+++ b/src/drivers/gnss/septentrio/septentrio.cpp
@@ -1677,7 +1677,7 @@ bool SeptentrioDriver::clock_needs_update(timespec real_time)
 	timespec rtc_system_time;
 
 	px4_clock_gettime(CLOCK_REALTIME, &rtc_system_time);
-	int drift_time = abs(rtc_system_time.tv_sec - real_time.tv_sec);
+	int drift_time = abs(static_cast<long>(rtc_system_time.tv_sec - real_time.tv_sec));
 
 	return drift_time >= k_max_allowed_clock_drift;
 }
diff --git a/src/drivers/gps/gps.cpp b/src/drivers/gps/gps.cpp
index df2c26c905..fee9b8b0f7 100644
--- a/src/drivers/gps/gps.cpp
+++ b/src/drivers/gps/gps.cpp
@@ -447,7 +447,7 @@ int GPS::callback(GPSCallbackType type, void *data1, int data2, void *user)
 
 		px4_clock_gettime(CLOCK_REALTIME, &rtc_system_time);
 		timespec rtc_gps_time = *(timespec *)data1;
-		int drift_time = abs(rtc_system_time.tv_sec - rtc_gps_time.tv_sec);
+		int drift_time = abs(static_cast<long>(rtc_system_time.tv_sec - rtc_gps_time.tv_sec));
 
 		if (drift_time >= SET_CLOCK_DRIFT_TIME_S) {
 			// as of 2021 setting the time on Nuttx temporarily pauses interrupts