diff --git a/memmap.go b/memmap.go
index 26a7e53..735bdaf 100644
--- a/memmap.go
+++ b/memmap.go
@@ -134,6 +134,7 @@ func (m *MemMapFs) Mkdir(name string, perm os.FileMode) error {
 		m.getData()[name] = item
 		m.registerWithParent(item)
 		m.mu.Unlock()
+		m.Chmod(name, perm)
 	}
 	return nil
 }
@@ -203,9 +204,11 @@ func (m *MemMapFs) lockfreeOpen(name string) (*mem.FileData, error) {
 }
 
 func (m *MemMapFs) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
+	chmod := false
 	file, err := m.openWrite(name)
 	if os.IsNotExist(err) && (flag&os.O_CREATE > 0) {
 		file, err = m.Create(name)
+		chmod = true
 	}
 	if err != nil {
 		return nil, err
@@ -227,6 +230,9 @@ func (m *MemMapFs) OpenFile(name string, flag int, perm os.FileMode) (File, erro
 			return nil, err
 		}
 	}
+	if chmod {
+		m.Chmod(name, perm)
+	}
 	return file, nil
 }
 
diff --git a/memmap_test.go b/memmap_test.go
index 9efd1f2..0bd10c9 100644
--- a/memmap_test.go
+++ b/memmap_test.go
@@ -102,6 +102,67 @@ func checkPathError(t *testing.T, err error, op string) {
 	}
 }
 
+// Ensure Permissions are set on OpenFile/Mkdir/MkdirAll
+func TestPermSet(t *testing.T) {
+	const fileName = "/myFileTest"
+	const dirPath =  "/myDirTest"
+	const dirPathAll =  "/my/path/to/dir"
+
+	const fileMode = os.FileMode(0765)
+
+	fs := NewMemMapFs()
+
+	// Test Openfile
+	f, err := fs.OpenFile(fileName, os.O_CREATE, fileMode)
+	if err != nil {
+		t.Errorf("OpenFile Create failed: %s", err)
+		return
+	}
+	f.Close()
+
+	s, err := fs.Stat(fileName)
+	if err != nil {
+		t.Errorf("Stat failed: %s", err)
+		return
+	}
+	if s.Mode().String() != fileMode.String() {
+		t.Errorf("Permissions Incorrect: %s != %s", s.Mode().String(), fileMode.String())
+		return
+	}
+
+	// Test Mkdir
+	err = fs.Mkdir(dirPath, fileMode)
+	if err != nil {
+		t.Errorf("MkDir Create failed: %s", err)
+		return
+	}
+	s, err = fs.Stat(dirPath)
+	if err != nil {
+		t.Errorf("Stat failed: %s", err)
+		return
+	}
+	if s.Mode().String() != fileMode.String() {
+		t.Errorf("Permissions Incorrect: %s != %s", s.Mode().String(), fileMode.String())
+		return
+	}
+
+	// Test MkdirAll
+	err = fs.MkdirAll(dirPathAll, fileMode)
+	if err != nil {
+		t.Errorf("MkDir Create failed: %s", err)
+		return
+	}
+	s, err = fs.Stat(dirPathAll)
+	if err != nil {
+		t.Errorf("Stat failed: %s", err)
+		return
+	}
+	if s.Mode().String() != fileMode.String() {
+		t.Errorf("Permissions Incorrect: %s != %s", s.Mode().String(), fileMode.String())
+		return
+	}
+}
+
 // Fails if multiple file objects use the same file.at counter in MemMapFs
 func TestMultipleOpenFiles(t *testing.T) {
 	defer removeAllTestFiles(t)