diff --git a/esmvaltool/utils/recipe_test_workflow/recipe_test_workflow/app/install_cold/bin/install_cold.sh b/esmvaltool/utils/recipe_test_workflow/recipe_test_workflow/app/install_cold/bin/install_cold.sh
index 6f36a4c027..04e960df74 100755
--- a/esmvaltool/utils/recipe_test_workflow/recipe_test_workflow/app/install_cold/bin/install_cold.sh
+++ b/esmvaltool/utils/recipe_test_workflow/recipe_test_workflow/app/install_cold/bin/install_cold.sh
@@ -39,4 +39,4 @@ git checkout 4527173
 
 # Manually and temporarily install imagehash (it will be included in the
 # next ESMValTool community environment).
-#rtw-env pip install imagehash -t "${CYLC_WORKFLOW_RUN_DIR}/lib/python"
+rtw-env pip install imagehash -t "${CYLC_WORKFLOW_RUN_DIR}/lib/python"