diff --git a/frigate/config/camera/detect.py b/frigate/config/camera/detect.py
index 35c337bc8..71dbc3292 100644
--- a/frigate/config/camera/detect.py
+++ b/frigate/config/camera/detect.py
@@ -1,6 +1,6 @@
 from typing import Optional
 
-from pydantic import Field
+from pydantic import Field, model_validator
 
 from ..base import FrigateBaseModel
 
@@ -88,3 +88,11 @@ class DetectConfig(FrigateBaseModel):
         title="Annotation offset",
         description="Milliseconds to shift detect annotations to better align timeline bounding boxes with recordings; can be positive or negative.",
     )
+
+    @model_validator(mode="after")
+    def validate_dimensions(self) -> "DetectConfig":
+        if (self.width is None) != (self.height is None):
+            raise ValueError(
+                "detect -> both width and height must be specified together, or both omitted"
+            )
+        return self
diff --git a/frigate/test/test_config.py b/frigate/test/test_config.py
index 132be131f..e82b688c6 100644
--- a/frigate/test/test_config.py
+++ b/frigate/test/test_config.py
@@ -1188,7 +1188,7 @@ class TestConfig(unittest.TestCase):
     def test_global_detect_merge(self):
         config = {
             "mqtt": {"host": "mqtt"},
-            "detect": {"max_disappeared": 1, "height": 720},
+            "detect": {"max_disappeared": 1, "height": 720, "width": 1280},
             "cameras": {
                 "back": {
                     "ffmpeg": {