diff --git a/detect.py b/detect.py
index d913921060d5..211a0049ae4b 100644
--- a/detect.py
+++ b/detect.py
@@ -94,9 +94,10 @@ def run(weights=ROOT / 'yolov5s.pt',  # model.pt path(s)
     imgsz = check_img_size(imgsz, s=stride)  # check image size
 
     # Half
+    if engine and model.trt_fp16_input != half:
+        LOGGER.info('model ' + ('requires' if model.trt_fp16_input else 'incompatible with') + ' --half. Adjusting automatically.')
+        half = model.trt_fp16_input
     half &= (pt or jit or onnx or engine) and device.type != 'cpu'  # FP16 supported on limited backends with CUDA
-    if engine:
-        assert (model.trt_fp16_input == half), 'model ' + ('requires' if model.trt_fp16_input else 'incompatible with') + ' --half'
     if pt or jit:
         model.model.half() if half else model.model.float()