diff --git a/scripts/qt55/travisbuild.sh b/scripts/qt55/travisbuild.sh
index c3fcb846f..060d36d46 100644
--- a/scripts/qt55/travisbuild.sh
+++ b/scripts/qt55/travisbuild.sh
@@ -3,5 +3,7 @@
 set -x
 set -e
 
-docker exec -t builder subsurface/scripts/build.sh -desktop
+docker exec -t builder subsurface/scripts/build.sh -desktop 2>&1 | tee build.log
+# fail the build if we didn't create the target binary
+grep /workspace/install-root/bin/subsurface build.log