diff --git a/script/app-mlperf-inference-mlcommons-python/customize.py b/script/app-mlperf-inference-mlcommons-python/customize.py
index 8d732b413..130fead1b 100644
--- a/script/app-mlperf-inference-mlcommons-python/customize.py
+++ b/script/app-mlperf-inference-mlcommons-python/customize.py
@@ -123,6 +123,8 @@ def preprocess(i):
     if int(
             NUM_THREADS) > 2 and env['MLC_MLPERF_DEVICE'] == "gpu" and env['MLC_MODEL'] != "rgat":
         NUM_THREADS = "2"  # Don't use more than 2 threads when run on GPU
+        if env['MLC_MODEL'] in ['retinanet']:
+            NUM_THREADS = "1"
 
     if env['MLC_MODEL'] in ['resnet50', 'retinanet',
                             'stable-diffusion-xl', 'rgat']: