diff --git a/Dockerfile b/Dockerfile
index 9cdeb62..a827395 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,7 +13,7 @@ RUN mkdir /tmp/proftpd
 RUN wget -qO- https://github.com/proftpd/proftpd/archive/$PROFTP_VERSION.tar.gz | tar -xz -C /tmp/proftpd --strip 1
 
 WORKDIR /tmp/proftpd
-RUN ./configure --with-modules=mod_ldap --with-modules=mod_tls
+RUN ./configure --with-modules=mod_ldap:mod_tls
 RUN patch -p1 -i /musl_mempcpy.patch
 RUN make && make install