diff --git a/demo/source/convert.sh b/demo/source/convert.sh
index 59da24c..8e0b8e1 100755
--- a/demo/source/convert.sh
+++ b/demo/source/convert.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-source_dir=$(readlink -f $(dirname "$0"))
+source_dir=$(readlink -f "$(dirname "$0")")
 demo_dir=$(dirname "$source_dir")
 
 (for f in "$source_dir"/*.webm; do echo "file '$f'"; done) | ffmpeg -f concat -safe 0 -i /dev/stdin -vf "fps=2,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" "$demo_dir/demo.gif" -y