diff --git a/build-and-test.sh b/build-and-test.sh
index 37db62d..b690d0f 100755
--- a/build-and-test.sh
+++ b/build-and-test.sh
@@ -37,6 +37,7 @@ if [ "x$TRAVIS_OS_NAME" != "xosx" ]; then
 else
     ARCH=osx
     brew update
+    brew install libtool
     brew install help2man
     brew install pkg-config
     brew install gengetopt