diff --git a/install b/install
index b54f5aa..369c820 100755
--- a/install
+++ b/install
@@ -72,10 +72,12 @@ git config --global user.name "Paul Walker"
 # git config --global user.signingKey FEF9C627
 # git config --global commit.gpgsign true
 
-git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
-if [ "$TMUX" != "" ] ; then
-  # If we're currently in tmux, source the new file.
-  tmux source-file ~/.tmux.conf
+if [ ! -d ~/.tmux/plugins/tpm ] ; then
+  git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
+  if [ "$TMUX" != "" ] ; then
+    # If we're currently in tmux, source the new file.
+    tmux source-file ~/.tmux.conf
+  fi
 fi
 
 ./install-vim