diff --git a/test/common.sh b/test/common.sh
index cb824b598f..81f8cdc57b 100755
--- a/test/common.sh
+++ b/test/common.sh
@@ -58,8 +58,21 @@ function install_istio() {
   echo ">> Installing Istio"
   echo "Istio version: ${ISTIO_VERSION}"
   echo "Istio profile: ${ISTIO_PROFILE}"
-  ${NET_ISTIO_DIR}/third_party/istio-${ISTIO_VERSION}/install-istio.sh ${ISTIO_PROFILE}
 
+  # TODO: Hack to walkaround knative-extensions/net-istio#1345
+  local net_istio_script library_path
+  net_istio_script="$(mktemp)"
+  library_path="$(go run knative.dev/hack/cmd/script library.sh)"
+  cat <<EOF >"${net_istio_script}"
+#!/bin/bash
+set -Eeuo pipefail
+
+source "$library_path"
+"${NET_ISTIO_DIR}/third_party/istio-${ISTIO_VERSION}/install-istio.sh" "${ISTIO_PROFILE}"
+EOF
+  chmod +x "${net_istio_script}"
+  "${net_istio_script}"
+  rm -f "${net_istio_script}"
 }
 
 function knative_setup() {