diff --git a/tools/install_pip.sh b/tools/install_pip.sh
index f3fd1e2..9afd2e5 100755
--- a/tools/install_pip.sh
+++ b/tools/install_pip.sh
@@ -91,7 +91,9 @@
             die $LINENO "Download of get-pip.py failed"
         touch $LOCAL_PIP.downloaded
     fi
-    sudo -H -E python${PYTHON3_VERSION} $LOCAL_PIP
+    # TODO: remove the trailing pip constraint when a proper fix
+    # arrives for bug https://bugs.launchpad.net/devstack/+bug/1906322
+    sudo -H -E python${PYTHON3_VERSION} $LOCAL_PIP -c $TOOLS_DIR/cap-pip.txt
 }