diff --git a/test/ete/labs/gwu/apt-proxy.sh b/test/ete/labs/gwu/apt-proxy.sh
index 74a180b..b2d5d1f 100755
--- a/test/ete/labs/gwu/apt-proxy.sh
+++ b/test/ete/labs/gwu/apt-proxy.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-sed -i '/#!\/bin\/bash/a\
+sed -i '/^            #!\/bin\/bash/a\
             # sleep up to 3 minutes to avoid disk contention\
             sleep $((RANDOM / 200))\
             mkdir -p /etc/docker\
diff --git a/test/ete/labs/huawei/apt-proxy.sh b/test/ete/labs/huawei/apt-proxy.sh
index 6fec3d0..1e2ccd6 100755
--- a/test/ete/labs/huawei/apt-proxy.sh
+++ b/test/ete/labs/huawei/apt-proxy.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-sed -i '/#!\/bin\/bash/a\
+sed -i '/^            #!\/bin\/bash/a\
             mkdir -p /etc/docker\
             cat > /etc/docker/daemon.json <<EOF\
             {\
diff --git a/test/ete/labs/tlab/apt-proxy.sh b/test/ete/labs/tlab/apt-proxy.sh
index 3cf5474..9203844 100755
--- a/test/ete/labs/tlab/apt-proxy.sh
+++ b/test/ete/labs/tlab/apt-proxy.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-sed -i '/#!\/bin\/bash/a\
+sed -i '/^            #!\/bin\/bash/a\
             mkdir -p /etc/docker\
             cat > /etc/docker/daemon.json <<EOF\
             {\
diff --git a/test/ete/labs/windriver/apt-proxy.sh b/test/ete/labs/windriver/apt-proxy.sh
index 365b5d0..13c8221 100755
--- a/test/ete/labs/windriver/apt-proxy.sh
+++ b/test/ete/labs/windriver/apt-proxy.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-sed -i '/#!\/bin\/bash/a\
+sed -i '/^            #!\/bin\/bash/a\
             mkdir -p /etc/docker\
             cat > /etc/docker/daemon.json <<EOF\
             {\