diff --git a/crates/ptth_quic/Dockerfile b/crates/ptth_quic/Dockerfile
index 96b1423..93d29ff 100644
--- a/crates/ptth_quic/Dockerfile
+++ b/crates/ptth_quic/Dockerfile
@@ -41,7 +41,8 @@ src/*.rs \
 crates/always_equal/src/*.rs \
 crates/ptth_core/src/*.rs \
 crates/ptth_relay/src/*.rs \
-crates/ptth_quic/src/*.rs
+crates/ptth_quic/src/*.rs \
+crates/udp_over_tcp/src/*.rs
 
 # Copy source tree
 # Yes, I tried a few variations on the syntax. Dockerfiles are just rough.
@@ -52,7 +53,7 @@ COPY ./crates/ptth_core     ./crates/ptth_core
 COPY ./crates/ptth_relay    ./crates/ptth_relay
 COPY ./handlebars/          ./handlebars
 COPY ./crates/ptth_quic     ./crates/ptth_quic
-COPY ./crates/udp_over_tcp   ./crates/udp_over_tcp
+COPY ./crates/udp_over_tcp  ./crates/udp_over_tcp
 
 # Bug in cargo's incremental build logic, triggered by
 # Docker doing something funny with mtimes? Maybe?