diff --git a/aiida_aimall/calculations.py b/aiida_aimall/calculations.py
index 3671140..c430ab1 100644
--- a/aiida_aimall/calculations.py
+++ b/aiida_aimall/calculations.py
@@ -99,6 +99,11 @@ def define(cls, spec):
         )
 
         spec.default_output_node = "output_parameters"
+        spec.exit_code(
+            210,
+            "ERROR_OUTPUT_MISSING",
+            message="The retrieved folder did not contain the output file.",
+        )
         spec.outputs.dynamic = True
 
         # would put error codes here
diff --git a/aiida_aimall/parsers.py b/aiida_aimall/parsers.py
index bebee95..6533b33 100644
--- a/aiida_aimall/parsers.py
+++ b/aiida_aimall/parsers.py
@@ -63,8 +63,7 @@ def parse(self, **kwargs):
             self.logger.error(
                 f"Found files '{files_retrieved}', expected to find '{files_expected}'"
             )
-            # return self.exit_codes.ERROR_MISSING_OUTPUT_FILES
-            return
+            return self.exit_codes.ERROR_MISSING_OUTPUT_FILES
 
         # parse output file
         self.logger.info(f"Parsing '{output_filename}'")
@@ -85,7 +84,7 @@ def parse(self, **kwargs):
         # store in node
         self.outputs.output_parameters = Dict(out_dict)
 
-        return  # ExitCode(0)
+        return ExitCode(0)
 
     def _parse_ldm(self, sum_lines):
         return qt.get_ldm(sum_lines.split("\n"))
diff --git a/tests/parsers/test_aimqbbaseparser.py b/tests/parsers/test_aimqbbaseparser.py
index 5e91441..2d3af88 100644
--- a/tests/parsers/test_aimqbbaseparser.py
+++ b/tests/parsers/test_aimqbbaseparser.py
@@ -76,6 +76,35 @@ def test_aimqb_parser_default(  # pylint:disable=too-many-arguments
     assert "cc_properties" in results_dict
 
 
+def test_empty_outfolder_returns_exitcode(  # pylint:disable=too-many-arguments
+    fixture_localhost,
+    generate_calc_job_node,
+    generate_parser,
+    generate_aimqb_inputs,
+    fixture_code,
+    filepath_tests,
+):
+    """Test an aimqb calculation"""
+    name = "empty"
+    entry_point_calc_job = "aimall.aimqb"
+    entry_point_parser = "aimall.base"
+
+    node = generate_calc_job_node(
+        entry_point_calc_job,
+        fixture_localhost,
+        name,
+        generate_aimqb_inputs(fixture_code, filepath_tests),
+    )
+
+    parser = generate_parser(entry_point_parser)
+
+    _, calcfunction = parser.parse_from_node(node, store_provenance=False)
+    assert (
+        calcfunction.exit_status
+        == node.process_class.exit_codes.ERROR_MISSING_OUTPUT_FILES.status
+    )
+
+
 def test_gaussiannode_returns_error(  # pylint:disable=too-many-arguments
     fixture_localhost,
     generate_calc_job_node,