diff --git a/cli/build.rs b/cli/build.rs
index 942c616981..d949b02c6e 100644
--- a/cli/build.rs
+++ b/cli/build.rs
@@ -47,7 +47,7 @@ fn main() -> std::io::Result<()> {
     if let Some((mut git_hash, maybe_date)) = get_git_timestamp_and_hash() {
         git_hash.truncate(16);
         println!(
-            "cargo:rustc-env=JJ_VERSION={}-{}-{}",
+            "cargo:rustc-env=JJ_VERSION={}+{}-{}",
             version,
             maybe_date
                 .map(|d| d.format("%Y%m%d").to_string())
diff --git a/cli/tests/test_global_opts.rs b/cli/tests/test_global_opts.rs
index 19b28d362a..a55f77d4c3 100644
--- a/cli/tests/test_global_opts.rs
+++ b/cli/tests/test_global_opts.rs
@@ -48,9 +48,9 @@ fn test_version() {
     let sanitized = stdout.replace(|c: char| c.is_ascii_hexdigit(), "?");
     let expected = [
         "jj ?.??.?\n",
-        "jj ?.??.?-????????-????????????????\n",
+        "jj ?.??.?+????????-????????????????\n",
         // `dateunknown` turns into `??t?unknown` since d,a,e are hex digits.
-        "jj ?.??.?-??t?unknown-????????????????\n",
+        "jj ?.??.?+??t?unknown-????????????????\n",
     ];
     assert!(
         expected.contains(&sanitized.as_str()),