diff --git a/.travis.yml b/.travis.yml
index 25f7e8f96..cdf416723 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -121,7 +121,7 @@ script:
   # Check that all installed files are in a component (no "unspecified
   # component" archive created)
   - (cd build && cpack -G TGZ -D CPACK_ARCHIVE_COMPONENT_INSTALL=ON &&
-     [ ! -a '*-Unspecified.tar.gz' ])
+     [ ! -e "*-Unspecified.tar.gz" ])
   # Keep this last
   - ( mkdir build_less_features && cd build_less_features &&
         rm -rf $PREFIX/asio-1.10.6 &&