diff --git a/build/build_dox.sh b/build/build_dox.sh
index 3091c8e17b..beef7d5406 100755
--- a/build/build_dox.sh
+++ b/build/build_dox.sh
@@ -6,7 +6,7 @@ DOXDIR=~/tgsdox
 
 mkdir -p $DOXDIR
 
-if [ "$TRAVIS_PULL_REQUEST" -eq "$false" ] && [ "$TRAVIS_BRANCH" -eq "master" ]; then
+if [ "$TRAVIS_PULL_REQUEST" = false ] && [ "$TRAVIS_BRANCH" = "master" ]; then
     PUBLISH_DOX=true
 else
     PUBLISH_DOX=false