diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09c68a8..956149f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Changelog
 
 ### master
+- bugfix in `key_binding_not_set`: the regex is now properly detecting key
+  bindings with `-r` flag.
 
 ### v2.1.0, 2014-12-12
 - check before binding `prefix + prefix` (@m1foley)
diff --git a/sensible.tmux b/sensible.tmux
index 84854f1..c0dd06c 100755
--- a/sensible.tmux
+++ b/sensible.tmux
@@ -41,7 +41,7 @@ server_option_value_not_changed() {
 
 key_binding_not_set() {
 	local key="$1"
-	if $(tmux list-keys | grep -q "bind-key[[:space:]]\+${key}"); then
+	if $(tmux list-keys | grep -q "bind-key[[:space:]]\+\(-r[[:space:]]\+\)\?${key}"); then
 		return 1
 	else
 		return 0