diff --git a/functions-common b/functions-common
index 87e6bb4..eeced62 100644
--- a/functions-common
+++ b/functions-common
@@ -1767,6 +1767,9 @@
     local name=$1
     local url=$2
     local branch=${3:-master}
+    if [[ ",${DEVSTACK_PLUGINS}," =~ ,${name}, ]]; then
+        die $LINENO "Plugin attempted to be enabled twice: ${name} ${url} ${branch}"
+    fi
     DEVSTACK_PLUGINS+=",$name"
     GITREPO[$name]=$url
     GITDIR[$name]=$DEST/$name