diff --git a/Dockerfile b/Dockerfile
index ec54a6b6a..ef8e02f4f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -57,7 +57,7 @@ ENV OPENVPN_USERNAME=**None** \
     TRANSMISSION_LPD_ENABLED=false \
     TRANSMISSION_MAX_PEERS_GLOBAL=200 \
     TRANSMISSION_MESSAGE_LEVEL=2 \
-    TRANSMISSION_PEER_CONGESTION_ALGORITHM= \
+    TRANSMISSION_PEER_CONGESTION_ALGORITHM="" \
     TRANSMISSION_PEER_ID_TTL_HOURS=6 \
     TRANSMISSION_PEER_LIMIT_GLOBAL=200 \
     TRANSMISSION_PEER_LIMIT_PER_TORRENT=50 \
@@ -86,7 +86,7 @@ ENV OPENVPN_USERNAME=**None** \
     TRANSMISSION_RPC_WHITELIST_ENABLED=false \
     TRANSMISSION_SCRAPE_PAUSED_TORRENTS_ENABLED=true \
     TRANSMISSION_SCRIPT_TORRENT_DONE_ENABLED=false \
-    TRANSMISSION_SCRIPT_TORRENT_DONE_FILENAME= \
+    TRANSMISSION_SCRIPT_TORRENT_DONE_FILENAME="" \
     TRANSMISSION_SEED_QUEUE_ENABLED=false \
     TRANSMISSION_SEED_QUEUE_SIZE=10 \
     TRANSMISSION_SPEED_LIMIT_DOWN=100 \
@@ -105,9 +105,9 @@ ENV OPENVPN_USERNAME=**None** \
     TRANSMISSION_HOME=/data/transmission-home \
     ENABLE_UFW=false \
     ENABLE_COMBUSTION_UI=false \
-    PUID=\
-    PGID=\
-    TRANSMISSION_WEB_HOME=
+    PUID="" \
+    PGID="" \
+    TRANSMISSION_WEB_HOME=""
 
 # Expose port and run
 EXPOSE 9091