diff --git a/conda-store-server/conda_store_server/action/generate_constructor_installer.py b/conda-store-server/conda_store_server/action/generate_constructor_installer.py
index 8d90ee158..6bce2e8f6 100644
--- a/conda-store-server/conda_store_server/action/generate_constructor_installer.py
+++ b/conda-store-server/conda_store_server/action/generate_constructor_installer.py
@@ -14,6 +14,7 @@ def action_generate_constructor_installer(
     conda_command: str,
     specification: schema.CondaSpecification,
     installer_dir: pathlib.Path,
+    version: str,
 ):
     # Helpers
     def print_cmd(cmd):
@@ -58,8 +59,7 @@ def write_file(filename, s):
             "name": specification.name,
             "channels": specification.channels,
             "specs": dependencies,
-            # XXX: This is required: use the env hash and datetime?
-            "version": 1,
+            "version": version,
         }
 
         if sys.platform == "win32":
diff --git a/conda-store-server/conda_store_server/build.py b/conda-store-server/conda_store_server/build.py
index 063d8c91c..679f6fc8d 100644
--- a/conda-store-server/conda_store_server/build.py
+++ b/conda-store-server/conda_store_server/build.py
@@ -403,6 +403,7 @@ def build_constructor_installer(db: Session, conda_store, build: orm.Build):
                     build.specification.spec
                 ),
                 installer_dir=pathlib.Path(tmpdir),
+                version=build.build_key,
             )
             output_filename = context.result
             append_to_logs(
diff --git a/conda-store-server/tests/test_actions.py b/conda-store-server/tests/test_actions.py
index 71d625735..df5d91a65 100644
--- a/conda-store-server/tests/test_actions.py
+++ b/conda-store-server/tests/test_actions.py
@@ -129,6 +129,7 @@ def test_generate_constructor_installer(conda_store, specification_name, request
         conda_command=conda_store.conda_command,
         specification=specification,
         installer_dir=installer_dir,
+        version="1",
     )
 
     # Checks that the installer was created