diff --git a/models/export.py b/models/export.py
index 2db6a7699953..6e3e1207f659 100644
--- a/models/export.py
+++ b/models/export.py
@@ -58,8 +58,7 @@
     # Update model
     if opt.half:
         img, model = img.half(), model.half()  # to FP16
-    if opt.train:
-        model.train()  # training mode (no grid construction in Detect layer)
+    model.train() if opt.train else model.eval()  # training mode = no Detect() layer grid construction
     for k, m in model.named_modules():
         m._non_persistent_buffers_set = set()  # pytorch 1.6.0 compatibility
         if isinstance(m, models.common.Conv):  # assign export-friendly activations