diff --git a/antigen.zsh b/antigen.zsh
index 014a2db..b4d751d 100644
--- a/antigen.zsh
+++ b/antigen.zsh
@@ -197,7 +197,11 @@ antigen-update () {
 
     # If its a specific branch that we want, checkout that branch.
     if [[ $url == *\|* ]]; then
-        Git checkout "${url#*|}"
+        local current_branch=${$(Git symbolic-ref HEAD)##refs/heads/}
+        local requested_branch="${url#*|}"
+        # Only do the checkout when we are not already on the branch
+        [[ $requested_branch != $current_branch ]] &&
+        Git checkout $requested_branch
     fi
 
     if ! [[ -z $old_rev || $old_rev == $new_rev ]]; then
diff --git a/tests/branch-bundle.t b/tests/branch-bundle.t
index 84e8193..82852dd 100644
--- a/tests/branch-bundle.t
+++ b/tests/branch-bundle.t
@@ -25,6 +25,10 @@ Load plugin from b1.
   $ hehe
   hehe from b1
 
+Does not say 'Already on b1' on each session startup.
+
+  $ antigen-bundle $PLUGIN_DIR --branch=b1
+
 Load plugin from master.
 
   $ antigen-bundle $PLUGIN_DIR