diff --git a/scripts/setup-ubuntu.sh b/scripts/setup-ubuntu.sh
index 345e4dfb5..c4fa45bdd 100755
--- a/scripts/setup-ubuntu.sh
+++ b/scripts/setup-ubuntu.sh
@@ -199,6 +199,9 @@ PACKAGES+=" triehash"
 # Needed by aspell dictionaries.
 PACKAGES+=" aspell"
 
+# Needed by package kphp.
+PACKAGES+=" python3-jsonschema"
+
 # Do not require sudo if already running as root.
 if [ "$(id -u)" = "0" ]; then
 	SUDO=""