diff --git a/dev_requirements.txt b/dev_requirements.txt
index 695ce38..8588009 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -5,7 +5,7 @@ sphinx
 sphinx_rtd_theme
 pytest
 pytest-cov
-casbin_sqlalchemy_adapter
+casbin_sqlalchemy_adapter==0.3.2
 coverage
 pypi-publisher
 bumpversion
\ No newline at end of file
diff --git a/flask_authz/casbin_enforcer.py b/flask_authz/casbin_enforcer.py
index 59841fa..19fc5ac 100644
--- a/flask_authz/casbin_enforcer.py
+++ b/flask_authz/casbin_enforcer.py
@@ -5,6 +5,7 @@
 from functools import wraps
 from abc import ABC
 from abc import abstractmethod
+import shlex
 
 from flask_authz.utils import authorization_decoder, UnSupportedAuthType
 
@@ -161,7 +162,9 @@ def sanitize_group_headers(headers_str, delimiter=',') -> list:
         Returns:
             list
         """
-
+        if delimiter == ' ' and ((headers_str.startswith("'") and headers_str.endswith("'")) or (
+                headers_str.startswith('"') and headers_str.endswith('"'))):
+            return [string.strip() for string in shlex.split(headers_str) if string != ""]
         return [string.strip() for string in headers_str.split(delimiter) if string != ""]
 
     def manager(self, func):
diff --git a/tests/test_casbin_enforcer.py b/tests/test_casbin_enforcer.py
index 12aa420..f4d2c9a 100644
--- a/tests/test_casbin_enforcer.py
+++ b/tests/test_casbin_enforcer.py
@@ -25,6 +25,7 @@ def enforcer(app_fixture):
     s.add(CasbinRule(ptype="p", v0="data2_admin", v1="/item", v2="GET"))
     s.add(CasbinRule(ptype="g", v0="alice", v1="data2_admin"))
     s.add(CasbinRule(ptype="g", v0="users", v1="data2_admin"))
+    s.add(CasbinRule(ptype="g", v0="group with space", v1="data2_admin"))
     s.commit()
     s.close()
 
@@ -57,10 +58,12 @@ def update_callback(self):
         ("X-User", "bob", "POST", 401, None),
         ("X-User", "bob", "DELETE", 401, None),
         ("X-Idp-Groups", "admin", "GET", 401, "X-User"),
-        ("X-Idp-Groups", "users", "GET", 200, None),
+        ("X-Idp-Groups", "group with space, users", "GET", 200, None),
         ("X-Idp-Groups", "noexist,testnoexist,users", "GET", 200, None),
         # ("X-Idp-Groups", "noexist testnoexist users", "GET", 200, None),
         ("X-Idp-Groups", "noexist, testnoexist, users", "GET", 200, None),
+        ("X-Idp-Groups", "group with space", "GET", 200, None),
+        ("X-Idp-Groups", "somegroup, group with space", "GET", 200, None),
         ("Authorization", "Basic Ym9iOnBhc3N3b3Jk", "GET", 200, "Authorization"),
         ("Authorization", "Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZGVudGl0eSI6ImJvYiJ9."
                           "LM-CqxAM2MtT2uT3AO69rZ3WJ81nnyMQicizh4oqBwk", "GET", 200, None),
@@ -146,6 +149,21 @@ def item():
     assert rv.status_code == status
 
 
+@pytest.mark.parametrize(
+    "header_string, expected_list",
+    [
+        ("noexist,testnoexist,users  ", ["noexist", "testnoexist", "users"]),
+        ("noexist testnoexist users", ["noexist", "testnoexist", "users"]),
+        ("noexist, testnoexist, users", ["noexist", "testnoexist", "users"]),
+        ("somegroup, group with space", ["somegroup", "group with space"]),
+        ("group with space", ["group with space"])
+    ]
+)
+def test_sanitize_group_headers(header_string, expected_list):
+    header_list = CasbinEnforcer.sanitize_group_headers(header_string)
+    assert header_list == expected_list
+
+
 def test_manager(app_fixture, enforcer):
     @app_fixture.route("/manager", methods=["POST"])
     @enforcer.manager
@@ -214,7 +232,8 @@ def owner_loader():
         ("noexist,   testnoexist,   users", ["noexist", "testnoexist", "users"]),
         ("noexist, testnoexist, users", ["noexist", "testnoexist", "users"]),
         ("somegroup, group with space", ["somegroup", "group with space"]),
-        ("group with space", ["group with space"])
+        ("group with space", ["group with space"]),
+        ("group 'with, space", ["group 'with", "space"])
     ]
 )
 def test_sanitize_group_headers(header_string, expected_list):
@@ -229,6 +248,13 @@ def test_sanitize_group_headers(header_string, expected_list):
         ("noexist   testnoexist   users", ["noexist", "testnoexist", "users"]),
         ("noexist, testnoexist, users", ["noexist,", "testnoexist,", "users"]),
         ("somegroup, group with space", ["somegroup,", "group", "with", "space"]),
+        ('"agroup" "delimited by" "spaces"', ["agroup", "delimited by", "spaces"]),
+        ("'agroup' 'delimited by' 'spaces'", ["agroup", "delimited by", "spaces"]),
+        ("group'with space", ["group'with", "space"]),
+        ("group' with space", ["group'", "with", "space"]),
+        ("'group with' space", ["'group", "with'", "space"]),  # quotes must be used on all groups, not only in 1
+        ('"group with space"', ["group with space"]),
+        ("'group with space'", ["group with space"]),
         ("group with space", ["group", "with", "space"])
     ]
 )