diff --git a/Web/Resgrid.Web.Tts/Dockerfile b/Web/Resgrid.Web.Tts/Dockerfile
index 83f4620b..fc95293e 100644
--- a/Web/Resgrid.Web.Tts/Dockerfile
+++ b/Web/Resgrid.Web.Tts/Dockerfile
@@ -26,6 +26,7 @@ RUN apt-get update \
 	&& apt-get install -y --no-install-recommends \
 		ffmpeg \
 		libespeak-ng1 \
+		espeak-ng-data \
 		ca-certificates \
 		curl \
 	&& mkdir -p /usr/local/share/piper-voices \