diff --git a/semaphore/semaphore-build-script.sh b/semaphore/semaphore-build-script.sh
index 2828a311..82861f90 100644
--- a/semaphore/semaphore-build-script.sh
+++ b/semaphore/semaphore-build-script.sh
@@ -4,8 +4,7 @@
 # When updating the build settings, please update this script too.
 
 sudo apt-get update
-sudo apt-get install -y valgrind check libevdev-dev libudev-dev doxygen
-graphviz
+sudo apt-get install -y valgrind check libevdev-dev libudev-dev doxygen graphviz
 autoreconf -ivf
 ./configure --prefix=$PWD/_build --with-udev-base-dir=$PWD/_build
 DISTCHECK_CONFIGURE_FLAGS="--with-udev-base-dir=$PWD/_build" make distcheck