diff --git a/CI/install-dependencies-osx.sh b/CI/install-dependencies-osx.sh
index 5d335d4d66829ce49debc79e47c6f1bf67681a6d..e7b52c20f8f38d6f71fe9d1395fabfdad66bf20f 100755
--- a/CI/install-dependencies-osx.sh
+++ b/CI/install-dependencies-osx.sh
@@ -10,7 +10,7 @@ set -e
 # Echo all commands before executing
 set -v
 
-if [ -v "$TRAVIS" ]; then
+if [[ $TRAVIS ]]; then
   git fetch --unshallow
 fi