diff --git a/constants/src/lib.rs b/constants/src/lib.rs
index 02b0f8f1..6a430f40 100644
--- a/constants/src/lib.rs
+++ b/constants/src/lib.rs
@@ -38,6 +38,7 @@ pub const TRUNK_ORG_URL_SLUG_ENV: &str = "TRUNK_ORG_URL_SLUG";
 pub const TRUNK_TEST_COLLECTION_ID_ENV: &str = "TRUNK_TEST_COLLECTION_ID";
 pub const TRUNK_REPO_ROOT_ENV: &str = "TRUNK_REPO_ROOT";
 pub const TRUNK_REPO_URL_ENV: &str = "TRUNK_REPO_URL";
+pub const TRUNK_FORK_REPO_URL_ENV: &str = "TRUNK_FORK_REPO_URL";
 pub const TRUNK_REPO_HEAD_SHA_ENV: &str = "TRUNK_REPO_HEAD_SHA";
 pub const TRUNK_REPO_HEAD_BRANCH_ENV: &str = "TRUNK_REPO_HEAD_BRANCH";
 pub const TRUNK_REPO_HEAD_COMMIT_EPOCH_ENV: &str = "TRUNK_REPO_HEAD_COMMIT_EPOCH";
@@ -91,6 +92,7 @@ pub const TRUNK_ENVS_TO_CAPTURE: &[&str] = &[
     TRUNK_TEST_COLLECTION_ID_ENV,
     TRUNK_REPO_ROOT_ENV,
     TRUNK_REPO_URL_ENV,
+    TRUNK_FORK_REPO_URL_ENV,
     TRUNK_REPO_HEAD_SHA_ENV,
     TRUNK_REPO_HEAD_BRANCH_ENV,
     TRUNK_REPO_HEAD_COMMIT_EPOCH_ENV,