diff --git a/ci-scripts/osx/travis-install.sh b/ci-scripts/osx/travis-install.sh
index 0fe7be5..405126d 100755
--- a/ci-scripts/osx/travis-install.sh
+++ b/ci-scripts/osx/travis-install.sh
@@ -6,6 +6,8 @@ brew install clang-format
 # from Homebrew 1.6.0 the old formula for obtaining Qt5.9.2 becomes invalid.
 # so we start to use the latest version of Qt. (#1910)
 brew install qt
+# delete older qt versions and make sure to have only the latest
+brew cleanup qt
 # temp workaround to brew installed glew cmake info overriding glew lib detection
 # which causes compiling issues later
 if [ -L /usr/local/lib/cmake/glew ]