diff --git a/mark2confluence/main.py b/mark2confluence/main.py
index 1b6b413..3daffaf 100755
--- a/mark2confluence/main.py
+++ b/mark2confluence/main.py
@@ -109,6 +109,9 @@ def begins_with_mark_headers(path: str, headers: List[str] = ["Space", "Parent",
         return True
   return False
 
+def begins_with_mark_space_header(path: str):
+  return begins_with_mark_headers(path, ["Space"])
+
 class MultilineCommentIsOpenException(Exception):
     pass
 
@@ -240,7 +243,7 @@ def get_default_parents(parents_string: str) -> List[ParentCfg]:
 def inject_default_parents(path: str, default_parents_cfg: List[ParentCfg]):
   file_dir = f"{os.path.dirname(os.path.abspath(path))}"
   for parent_cfg in default_parents_cfg:
-    if parent_cfg.is_directory_included(file_dir):
+    if parent_cfg.is_directory_included(file_dir) and not begins_with_mark_space_header(path):
       header = parent_cfg.get_header()
       with open(path, 'r') as f:
         file_content = f.read()
diff --git a/tests/resources/markdown/test_inject_default_parents/0-input.md b/tests/resources/markdown/test_inject_default_parents/0-input.md
index b6ded31..e3665b5 100644
--- a/tests/resources/markdown/test_inject_default_parents/0-input.md
+++ b/tests/resources/markdown/test_inject_default_parents/0-input.md
@@ -1 +1,2 @@
 <!-- Parent: BAZ -->
+<!-- Title: BIM -->
diff --git a/tests/resources/markdown/test_inject_default_parents/0-output.md b/tests/resources/markdown/test_inject_default_parents/0-output.md
index cab0c27..3881b61 100644
--- a/tests/resources/markdown/test_inject_default_parents/0-output.md
+++ b/tests/resources/markdown/test_inject_default_parents/0-output.md
@@ -1,3 +1,4 @@
 <!-- Space: FOO -->
 <!-- Parent: BAR -->
 <!-- Parent: BAZ -->
+<!-- Title: BIM -->
diff --git a/tests/resources/markdown/test_inject_default_parents/1-input.md b/tests/resources/markdown/test_inject_default_parents/1-input.md
new file mode 100644
index 0000000..0882250
--- /dev/null
+++ b/tests/resources/markdown/test_inject_default_parents/1-input.md
@@ -0,0 +1,3 @@
+<!-- Space: BAR -->
+<!-- Parent: BARED -->
+<!-- Title: BORED -->
diff --git a/tests/resources/markdown/test_inject_default_parents/1-output.md b/tests/resources/markdown/test_inject_default_parents/1-output.md
new file mode 100644
index 0000000..0882250
--- /dev/null
+++ b/tests/resources/markdown/test_inject_default_parents/1-output.md
@@ -0,0 +1,3 @@
+<!-- Space: BAR -->
+<!-- Parent: BARED -->
+<!-- Title: BORED -->
diff --git a/tests/test_main.py b/tests/test_main.py
index 1d1e7fb..74e687b 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -127,14 +127,22 @@ def test_get_default_parents(string, expected_parents_count):
 def test_ParentCfg_get_header(cfg: main.ParentCfg, expected_header):
     assert cfg.get_header() == expected_header
 
-def test_inject_default_parents(monkeypatch):
+@pytest.mark.parametrize(
+  ids=("skip file with space mark header", "properly inject default headers"),
+  argnames="tested_file_name, expected_file_name",
+  argvalues=[
+      ("0-input.md", "0-output.md"),
+      ("1-input.md", "1-output.md"),
+  ],
+)
+def test_inject_default_parents(monkeypatch, tested_file_name, expected_file_name):
     monkeypatch.setattr('mark2confluence.main.cfg', dot.dotify({"github": {"WORKSPACE": WORKSPACE}}))
 
     base_dir = f"{RESOURCE_DIR}/markdown/test_inject_default_parents"
-    source_file_path = f"{base_dir}/0-input.md"
-    expected_file_path = f"{base_dir}/0-output.md"
-    parsed_file_dir = f"{WORKSPACE}/tests/foo"
-    parsed_file_path = f"{parsed_file_dir}/parsed_file.md"
+    source_file_path = os.path.join(base_dir, tested_file_name)
+    expected_file_path = os.path.join(base_dir, expected_file_name)
+    parsed_file_dir = os.path.join(WORKSPACE, "tests", "foo")
+    parsed_file_path = os.path.join(parsed_file_dir, "parsed_file.md")
     cfgs = [
         main.ParentCfg(directory="tests/foo/bar", space="FOO", parents=["BAZ"]),
         main.ParentCfg(directory="tests/foo/*", space="FOO", parents=["BAR"]),