diff --git a/docker/organic_test/foreign_document_test_entrypoint.sh b/docker/organic_test/foreign_document_test_entrypoint.sh
index 29a7363..8f0c90f 100644
--- a/docker/organic_test/foreign_document_test_entrypoint.sh
+++ b/docker/organic_test/foreign_document_test_entrypoint.sh
@@ -18,6 +18,9 @@ function die {
 
 function main {
     cargo build --no-default-features --features compare --profile release-lto
+    if [ "${CARGO_TARGET_DIR:-}" = "" ]; then
+        CARGO_TARGET_DIR=$(realpath target/)
+    fi
     PARSE="${CARGO_TARGET_DIR}/release-lto/parse"
 
     run_compare "org-mode/org-guide.org" "/foreign_documents/org-mode/org-guide.org"