diff --git a/gns3server/utils/__init__.py b/gns3server/utils/__init__.py
index e8e0a297..abefda8d 100644
--- a/gns3server/utils/__init__.py
+++ b/gns3server/utils/__init__.py
@@ -19,15 +19,16 @@
 import re
 import os
 import textwrap
-import pathlib
+import posixpath
+
 
 def force_unix_path(path):
     """
     :param path: Path to convert
     """
 
-    p = pathlib.Path(os.path.normpath(path))
-    return p.as_posix()
+    path = path.replace("\\", "/")
+    return posixpath.normpath(path)
 
 
 def macaddress_to_int(mac_address):
diff --git a/gns3server/utils/images.py b/gns3server/utils/images.py
index 455f21e0..a838a1d1 100644
--- a/gns3server/utils/images.py
+++ b/gns3server/utils/images.py
@@ -71,7 +71,7 @@ def images_directories(type):
         raise NotImplementedError("%s is not supported", type)
     os.makedirs(type_img_directory, exist_ok=True)
     paths.append(type_img_directory)
-    for directory in server_config.get("additional_images_path", "").split(":"):
+    for directory in server_config.get("additional_images_path", "").split(";"):
         paths.append(directory)
     # Compatibility with old topologies we look in parent directory
     paths.append(img_dir)
diff --git a/tests/compute/test_manager.py b/tests/compute/test_manager.py
index eb88aa7e..647d63ce 100644
--- a/tests/compute/test_manager.py
+++ b/tests/compute/test_manager.py
@@ -136,7 +136,7 @@ def test_get_abs_image_additional_image_paths(qemu, tmpdir):
 
     with patch("gns3server.config.Config.get_section_config", return_value={
             "images_path": str(tmpdir / "images1"),
-            "additional_images_path": "/tmp/null24564:{}".format(str(tmpdir / "images2")),
+            "additional_images_path": "/tmp/null24564;{}".format(str(tmpdir / "images2")),
             "local": False}):
         assert qemu.get_abs_image_path("test1.bin") == path1
         assert qemu.get_abs_image_path("test2.bin") == path2
diff --git a/tests/test_utils.py b/tests/test_utils.py
index c188c044..af7d9815 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -23,8 +23,7 @@ def test_force_unix_path():
     assert force_unix_path("a/b") == "a/b"
     assert force_unix_path("a\\b") == "a/b"
     assert force_unix_path("a\\b\\..\\c") == "a/c"
-    if sys.platform.startswith("win"):
-        assert force_unix_path("C:\Temp") == "C:/Temp"
+    assert force_unix_path("C:\Temp") == "C:/Temp"
 
 
 def test_macaddress_to_int():
diff --git a/tests/utils/test_images.py b/tests/utils/test_images.py
index 48c2fb6f..5fb0fad2 100644
--- a/tests/utils/test_images.py
+++ b/tests/utils/test_images.py
@@ -34,7 +34,7 @@ def test_images_directories(tmpdir):
 
     with patch("gns3server.config.Config.get_section_config", return_value={
             "images_path": str(tmpdir / "images1"),
-            "additional_images_path": "/tmp/null24564:{}".format(tmpdir / "images2"),
+            "additional_images_path": "/tmp/null24564;{}".format(tmpdir / "images2"),
             "local": False}):
 
         # /tmp/null24564 is ignored because doesn't exists
@@ -115,7 +115,7 @@ def test_scan_for_images(tmpdir):
 
     with patch("gns3server.config.Config.get_section_config", return_value={
             "images_path": str(tmpdir / "images1"),
-            "additional_images_path": "/tmp/null24564:{}".format(tmpdir / "images2"),
+            "additional_images_path": "/tmp/null24564;{}".format(tmpdir / "images2"),
             "local": False}):
 
         assert scan_for_images("dynamips") == [str(path1), str(path2)]