diff --git a/playbooks/mpdf.yaml b/playbooks/mpdf.yaml
index dd7c16f..e481066 100644
--- a/playbooks/mpdf.yaml
+++ b/playbooks/mpdf.yaml
@@ -35,7 +35,7 @@
     replaygain_preamp: 0
     volume_normalization: no
     audio_buffer_size: 2048
-    buffer_before_play: 1%
+    buffer_before_play: "1%"
   
   tasks:
     - name: Install mpdf on hosts