diff --git a/dbt_meshify/dbt_projects.py b/dbt_meshify/dbt_projects.py
index eb14350..e65e694 100644
--- a/dbt_meshify/dbt_projects.py
+++ b/dbt_meshify/dbt_projects.py
@@ -390,25 +390,29 @@ def _rename_project(self) -> None:
         project_dict["name"] = self.name
         self.project = Project.from_dict(project_dict)
 
+    def _get_macro_dependencies(self, unique_id: str) -> Set[str]:
+        resource = self.get_manifest_node(unique_id)
+        if not resource or any(isinstance(resource, class_) for class_ in [Documentation, Group]):
+            return set()
+        macros = resource.depends_on.macros  # type: ignore
+        project_macros = {
+            macro
+            for macro in macros
+            if hashlib.md5((macro.split(".")[1]).encode()).hexdigest()
+            == self.manifest.metadata.project_id
+        }
+        return project_macros
+
     def _get_custom_macros(self) -> Set[str]:
         """
         get a set of macro unique_ids for all the selected resources
         """
         macros_set = set()
         for unique_id in self.resources:
-            resource = self.get_manifest_node(unique_id)
-            if not resource or any(
-                isinstance(resource, class_) for class_ in [Documentation, Group]
-            ):
-                continue
-            macros = resource.depends_on.macros  # type: ignore
-            project_macros = [
-                macro
-                for macro in macros
-                if hashlib.md5((macro.split(".")[1]).encode()).hexdigest()
-                == self.manifest.metadata.project_id
-            ]
+            project_macros = self._get_macro_dependencies(unique_id)
             macros_set.update(project_macros)
+            for macro in project_macros:
+                macros_set.update(self._get_macro_dependencies(macro))
         return macros_set
 
     def _get_indirect_groups(self) -> Set[str]:
diff --git a/test-projects/split/split_proj/macros/cents_to_dollars.sql b/test-projects/split/split_proj/macros/cents_to_dollars.sql
index dd3b99a..efe3361 100644
--- a/test-projects/split/split_proj/macros/cents_to_dollars.sql
+++ b/test-projects/split/split_proj/macros/cents_to_dollars.sql
@@ -1,5 +1,5 @@
 {# A basic example for a project-wide macro to cast a column uniformly #}
 
 {% macro cents_to_dollars(column_name, precision=2) -%}
-    ({{ column_name }} / 100)::numeric(16, {{ precision }})
+    ({{ column_name }} / 100)::{{ type_numeric() }}(16, {{ precision }})
 {%- endmacro %}
diff --git a/test-projects/split/split_proj/macros/type_numeric.sql b/test-projects/split/split_proj/macros/type_numeric.sql
new file mode 100644
index 0000000..9688adc
--- /dev/null
+++ b/test-projects/split/split_proj/macros/type_numeric.sql
@@ -0,0 +1,3 @@
+{%- macro type_numeric() -%}
+    numeric
+{%- endmacro -%}
diff --git a/tests/integration/test_split_command.py b/tests/integration/test_split_command.py
index 9d69aeb..abfd653 100644
--- a/tests/integration/test_split_command.py
+++ b/tests/integration/test_split_command.py
@@ -111,6 +111,10 @@ def test_split_one_model_one_source_custom_macro(self, project):
         assert (
             Path(dest_project_path) / "my_new_project" / "macros" / "cents_to_dollars.sql"
         ).exists()
+        # copied custom macro parents too!
+        assert (
+            Path(dest_project_path) / "my_new_project" / "macros" / "type_numeric.sql"
+        ).exists()
 
         # assert only one source moved
         source_yml = yaml.safe_load(