diff --git a/.github/scripts/install_deps.sh b/.github/scripts/install_deps.sh
index ed79f9fc..21cadca0 100755
--- a/.github/scripts/install_deps.sh
+++ b/.github/scripts/install_deps.sh
@@ -5,7 +5,7 @@ set -eu
 case "${1%-*}" in
 	ubuntu)
 		sudo apt-get -qq update
-		sudo apt-get install -yq bison libpng-dev
+		sudo apt-get install -yq bison libpng-dev pkg-config
 		;;
 	macos)
 		# macOS bundles GNU Make 3.81, which doesn't support synced output.