diff --git a/tpm b/tpm
index 287f9bb..5851241 100755
--- a/tpm
+++ b/tpm
@@ -30,13 +30,13 @@ source_plugins() {
 # prefix + U - updates a plugin (or all of them) and reloads TMUX environment
 # prefix + alt + u - remove unused TPM plugins and reloads TMUX environment
 set_tpm_key_bindings() {
-	local install_key=$(get_tmux_option "$install_key_option" "$default_install_key")
+	local install_key="$(get_tmux_option "$install_key_option" "$default_install_key")"
 	tmux bind-key "$install_key" run-shell "$BINDINGS_DIR/install_plugins"
 
-	local update_key=$(get_tmux_option "$update_key_option" "$default_update_key")
+	local update_key="$(get_tmux_option "$update_key_option" "$default_update_key")"
 	tmux bind-key "$update_key" run-shell "$BINDINGS_DIR/update_plugins"
 
-	local clean_key=$(get_tmux_option "$clean_key_option" "$default_clean_key")
+	local clean_key="$(get_tmux_option "$clean_key_option" "$default_clean_key")"
 	tmux bind-key "$clean_key" run-shell "$BINDINGS_DIR/clean_plugins"
 }