diff --git a/tmux-thumbs.tmux b/tmux-thumbs.tmux
index f31fcd1..4fc9355 100755
--- a/tmux-thumbs.tmux
+++ b/tmux-thumbs.tmux
@@ -2,11 +2,12 @@
 
 CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
-DEFAULT_THUMBS_KEY="space"
-THUMBS_KEY=$(tmux show-option -gqv @thumbs-key)
+DEFAULT_THUMBS_KEY=space
+
+THUMBS_KEY="$(tmux show-option -gqv @thumbs-key)"
 THUMBS_KEY=${THUMBS_KEY:-$DEFAULT_THUMBS_KEY}
 
-tmux bind-key $THUMBS_KEY run-shell -b "${CURRENT_DIR}/tmux-thumbs.sh"
+tmux bind-key "${THUMBS_KEY}" run-shell -b "${CURRENT_DIR}/tmux-thumbs.sh"
 
 BINARY="${CURRENT_DIR}/target/release/thumbs"