diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 1d892c40..14ec19ff 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -54,7 +54,7 @@ RUN set -ex; \
         pdo_mysql \
         pdo_pgsql \
         zip \
-        gmp
+        gmp \
     ; \
     \
 # pecl will claim success even if one install fails, so we need to perform each install separately