diff --git a/travis/osx/before_install.sh b/travis/osx/before_install.sh
index fd861e8d9..5d57973ed 100755
--- a/travis/osx/before_install.sh
+++ b/travis/osx/before_install.sh
@@ -19,6 +19,9 @@ rm -rf '/usr/local/include/c++'
 ## brew install --HEAD travis/libkml.rb
 sudo chmod -R +w /usr/local
 
+brew update
+brew install bison@2.7
+
 # GSL - install from source due to homebrew issues
 curl -k -O https://ftp.gnu.org/gnu/gsl/gsl-2.6.tar.gz
 tar xf gsl-2.6.tar.gz
diff --git a/travis/osx/before_script.sh b/travis/osx/before_script.sh
index 809f73711..8c4dd5a4d 100755
--- a/travis/osx/before_script.sh
+++ b/travis/osx/before_script.sh
@@ -24,6 +24,8 @@ cd ..
 
 cp qwt/qwtconfig.pri.in qwt/qwtconfig.pri
 cp src/gcconfig.pri.in src/gcconfig.pri
+# Bison
+echo QMAKE_YACC=/usr/local/opt/bison@2.7/bin/bison >> src/gcconfig.pri
 # Define GC version string, only for tagged builds
 if [ -n "$TRAVIS_TAG" ]; then echo DEFINES += GC_VERSION=VERSION_STRING >> src/gcconfig.pri; fi
 sed -i "" "s|#\(CONFIG += release.*\)|\1 static |" src/gcconfig.pri