diff --git a/debian/tests/control b/debian/tests/control
index cdbb69cbc6..345f6efc56 100644
--- a/debian/tests/control
+++ b/debian/tests/control
@@ -38,6 +38,7 @@ Depends: @,
   ruby-knapsack,
   ruby-simple-po-parser,
   ruby-timecop (>= 0.9.1~),
+  ruby-png-quantizator,
   ruby-parallel (>= 1.19~),
   ruby-rblineprof
 Restrictions: needs-root, needs-internet