diff --git a/controlnet_ext/controlnet_ext.py b/controlnet_ext/controlnet_ext.py
index c95c276..be1ac80 100644
--- a/controlnet_ext/controlnet_ext.py
+++ b/controlnet_ext/controlnet_ext.py
@@ -5,12 +5,25 @@ from functools import lru_cache
 from pathlib import Path
 
 from modules import sd_models, shared
-from modules.paths import data_path, models_path
+from modules.paths import data_path, models_path, script_path
 
-extensions_path = Path(data_path, "extensions")
-controlnet_exists = any(
-    p.name == "sd-webui-controlnet" for p in extensions_path.iterdir() if p.is_dir()
-)
+ext_path = Path(data_path, "extensions")
+ext_builtin_path = Path(script_path, "extensions-builtin")
+is_in_builtin = False  # compatibility for vladmandic/automatic
+controlnet_exists = False
+
+if ext_path.exists():
+    controlnet_exists = any(
+        p.name == "sd-webui-controlnet" for p in ext_path.iterdir() if p.is_dir()
+    )
+
+if not controlnet_exists and ext_builtin_path.exists():
+    controlnet_exists = any(
+        p.name == "sd-webui-controlnet" for p in ext_builtin_path.iterdir()
+    )
+
+    if controlnet_exists:
+        is_in_builtin = True
 
 
 class ControlNetExt:
@@ -20,10 +33,13 @@ class ControlNetExt:
         self.external_cn = None
 
     def init_controlnet(self) -> bool:
+        if is_in_builtin:
+            import_path = "extensions-builtin.sd-webui-controlnet.scripts.external_code"
+        else:
+            import_path = "extensions.sd-webui-controlnet.scripts.external_code"
+
         try:
-            self.external_cn = importlib.import_module(
-                "extensions.sd-webui-controlnet.scripts.external_code", "external_code"
-            )
+            self.external_cn = importlib.import_module(import_path, "external_code")
             self.cn_available = True
             models = self.external_cn.get_models()
             self.cn_models.extend(m for m in models if "inpaint" in m)
@@ -49,6 +65,23 @@ class ControlNetExt:
             self._update_scripts_args(p, model, weight)
 
 
+def get_cn_model_dirs() -> list[Path]:
+    cn_model_dir = Path(models_path, "ControlNet")
+    if is_in_builtin:
+        cn_model_dir_old = Path(ext_builtin_path, "sd-webui-controlnet", "models")
+    else:
+        cn_model_dir_old = Path(ext_path, "sd-webui-controlnet", "models")
+    ext_dir1 = shared.opts.data.get("control_net_models_path", "")
+    ext_dir2 = shared.opts.data.get("controlnet_dir", "")
+
+    dirs = [cn_model_dir, cn_model_dir_old]
+    for ext_dir in [ext_dir1, ext_dir2]:
+        if ext_dir:
+            dirs.append(Path(ext_dir))
+
+    return dirs
+
+
 @lru_cache
 def _get_cn_inpaint_models() -> list[str]:
     """
@@ -56,19 +89,13 @@ def _get_cn_inpaint_models() -> list[str]:
     controlnet's `list(global_state.cn_models_names.values())`.
     """
     cn_model_exts = (".pt", ".pth", ".ckpt", ".safetensors")
-    cn_model_dir = Path(models_path, "ControlNet")
-    cn_model_dir_old = Path(extensions_path, "sd-webui-controlnet", "models")
-    ext_dir1 = shared.opts.data.get("control_net_models_path", "")
-    ext_dir2 = shared.opts.data.get("controlnet_dir", "")
+    dirs = get_cn_model_dirs()
     name_filter = shared.opts.data.get("control_net_models_name_filter", "")
     name_filter = name_filter.strip(" ").lower()
 
     model_paths = []
 
-    for base in [cn_model_dir, cn_model_dir_old, ext_dir1, ext_dir2]:
-        if not base:
-            continue
-        base = Path(base)
+    for base in dirs:
         if not base.exists():
             continue