diff --git a/src/pk-time.c b/src/pk-time.c
index 41791b4..327318b 100644
--- a/src/pk-time.c
+++ b/src/pk-time.c
@@ -133,6 +133,8 @@ pk_time_get_gradient (PkTimeItem *item1, PkTimeItem *item2)
 	gfloat dx;
 	dy = (gfloat) (item1->percentage - item2->percentage);
 	dx = (gfloat) (item1->time - item2->time);
+	if (dx > -0.001 && dx < 0.001)
+		return 0;
 	return dy/dx;
 }