diff --git a/src/pacman/callback.c b/src/pacman/callback.c
index 7f72b84..051a65a 100644
--- a/src/pacman/callback.c
+++ b/src/pacman/callback.c
@@ -18,6 +18,8 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <float.h>
+#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -189,7 +191,7 @@ void cb_event(alpm_event_t *event)
 				alpm_event_hook_run_t *e = &event->hook_run;
 				int digits = number_length(e->total);
 				printf("(%*zu/%*zu) %s\n", digits, e->position,
-						digits, e->total, 
+						digits, e->total,
 						e->desc ? e->desc : e->name);
 			}
 			break;
@@ -747,6 +749,13 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)
 			/* return if the calling interval was too short */
 			return;
 		}
+		if(((double)(xfered - xfered_last) / (timediff / 1000.0)) < 0)
+			fprintf(stderr, "xfered_last: %ld; xfered: %ld;\n"
+			        "file_xfered: %ld; list_xfered: %ld;\n"
+			        "timediff: %"PRId64"\n",
+			        xfered_last, xfered,
+			        file_xfered, list_xfered,
+			        timediff);
 		rate = (double)(xfered - xfered_last) / (timediff / 1000.0);
 		/* average rate to reduce jumpiness */
 		rate = (rate + 2 * rate_last) / 3;