diff --git a/src/modules/dataman/dataman.c b/src/modules/dataman/dataman.c
index b10e7f7b7f..30d7e359da 100644
--- a/src/modules/dataman/dataman.c
+++ b/src/modules/dataman/dataman.c
@@ -715,10 +715,14 @@ task_main(int argc, char *argv[])
 		int file_size = lseek(g_task_fd, 0, SEEK_END);
 
 		if ((file_size % k_sector_size) != 0) {
-			warnx("Incompatible data manager file %s, resetting it", k_data_manager_device_path);
-			warnx("Size: %u, sector size: %d", file_size, k_sector_size);
+			PX4_WARN("Incompatible data manager file %s, resetting it", k_data_manager_device_path);
+			PX4_WARN("Size: %u, sector size: %d", file_size, k_sector_size);
 			close(g_task_fd);
+#ifndef __PX4_POSIX
+			// XXX on Mac OS and Linux the file is not a multiple of the sector sizes
+			// this might need further inspection
 			unlink(k_data_manager_device_path);
+#endif
 
 		} else {
 			close(g_task_fd);