diff --git a/Dockerfile b/Dockerfile
index 2c8bb42..99b41e2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,8 @@ LABEL maintainer="Jonathan Ervine docker@ervine.org"
 ENV LANG='en_US.UTF-8' \
     LANGUAGE='en_US.UTF-8' \
     TERM='xterm' \
-    VERSION='3' 
+    VERSION='3' \
+    MONO_TLS_PROVIDER=legacy
 
 RUN echo http://dl-4.alpinelinux.org/alpine/edge/testing >> /etc/apk/repositories && \
   apk -U update && \
@@ -29,4 +30,4 @@ EXPOSE 8989
 
 USER sonarr
 
-CMD [ "exec", "env", "MONO_TLS_PROVIDER=legacy", "/usr/bin/mono", "--debug", "/Sonarr/Sonarr.exe", "--nobrowser", "--data=/config" ]
+CMD [ "/usr/bin/mono", "--debug", "/Sonarr/Sonarr.exe", "--nobrowser", "--data=/config" ]