diff --git a/src/modules/logger/logger.cpp b/src/modules/logger/logger.cpp
index e630c0fcac..af35f37851 100644
--- a/src/modules/logger/logger.cpp
+++ b/src/modules/logger/logger.cpp
@@ -2117,7 +2117,7 @@ int Logger::check_free_space()
 
 
 		uint64_t min_free_bytes = 300ULL * 1024ULL * 1024ULL;
-		uint64_t total_bytes = statfs_buf.f_blocks * statfs_buf.f_bsize / 10;
+		uint64_t total_bytes = statfs_buf.f_blocks * statfs_buf.f_bsize;
 
 		if (total_bytes / 10 < min_free_bytes) { // reduce the minimum if it's larger than 10% of the disk size
 			min_free_bytes = total_bytes / 10;
@@ -2149,7 +2149,7 @@ int Logger::check_free_space()
 		}
 
 		PX4_INFO("removing log directory %s to get more space (left=%u MiB)", directory_to_delete,
-			 (unsigned int)(statfs_buf.f_bavail / 1024U * statfs_buf.f_bsize / 1024U));
+			 (unsigned int)(statfs_buf.f_bavail * statfs_buf.f_bsize / 1024U / 1024U));
 
 		if (remove_directory(directory_to_delete)) {
 			PX4_ERR("Failed to delete directory");
@@ -2163,7 +2163,7 @@ int Logger::check_free_space()
 	if (statfs_buf.f_bavail < (px4_statfs_buf_f_bavail_t)(50 * 1024 * 1024 / statfs_buf.f_bsize)) {
 		mavlink_log_critical(&_mavlink_log_pub,
 				     "[logger] Not logging; SD almost full: %u MiB",
-				     (unsigned int)(statfs_buf.f_bavail / 1024U * statfs_buf.f_bsize / 1024U));
+				     (unsigned int)(statfs_buf.f_bavail * statfs_buf.f_bsize / 1024U / 1024U));
 		return 1;
 	}