diff --git a/Dockerfile b/Dockerfile
index fcf476e..fc48849 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,7 +21,7 @@ ARG gitcommithash=HEAD
 
 RUN git checkout "$gitcommithash" \
 && git reset --hard \
-&& echo "pub const GIT_VERSION: &str = \"$(git-rev-parse HEAD)\";" > src/git_version.rs \
+&& echo "pub const GIT_VERSION: Option <&str> = Some (\"$(git-rev-parse HEAD)\");" > src/git_version.rs \
 && cargo test --release \
 && cargo build --release --bin ptth_relay
 
diff --git a/src/bin/ptth_relay.rs b/src/bin/ptth_relay.rs
index ef43258..71314da 100644
--- a/src/bin/ptth_relay.rs
+++ b/src/bin/ptth_relay.rs
@@ -19,5 +19,7 @@ async fn main () -> Result <(), Box <dyn Error>> {
 		toml::from_str (&config_s).expect (&format! ("Can't parse {:?} as TOML", config_file_path))
 	};
 	
+	eprintln! ("ptth_relay Git version: {:?}", ptth::git_version::GIT_VERSION);
+	
 	ptth::relay::main (config_file).await
 }
diff --git a/src/git_version.rs b/src/git_version.rs
new file mode 100644
index 0000000..ff014a3
--- /dev/null
+++ b/src/git_version.rs
@@ -0,0 +1 @@
+pub const GIT_VERSION: Option <&str> = None;
diff --git a/src/lib.rs b/src/lib.rs
index a0ba6b2..dddcb52 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,6 +10,7 @@ pub const PTTH_MAGIC_HEADER: &str = "X-PTTH-2LJYXWC4";
 // Basically binaries, but in the lib we can do experimental
 // test stuff like spawn them both in the same process
 
+pub mod git_version;
 pub mod relay;
 pub mod server;