diff --git a/docs/docsite/rst/guide_gce.rst b/docs/docsite/rst/guide_gce.rst
index 4c891645c5..fda21c2946 100644
--- a/docs/docsite/rst/guide_gce.rst
+++ b/docs/docsite/rst/guide_gce.rst
@@ -168,7 +168,7 @@ For the following use case, let's use this small shell script as a wrapper.
     exit 1
   fi
 
-  export SSL_CERT_FILE=$(pwd)/cacert.cer
+  export SSL_CERT_FILE=$(pwd)/cacert.pem
   export ANSIBLE_HOST_KEY_CHECKING=False
 
   if [[ ! -f "$SSL_CERT_FILE" ]]; then