diff --git a/train.py b/train.py
index 7ff15b7d..8c386687 100644
--- a/train.py
+++ b/train.py
@@ -305,6 +305,11 @@ if __name__ == '__main__':
                 x = (np.random.randn(1) * 0.3 + 1) ** 1.1  # plt.hist(x.ravel(), 100)
                 hyp[k] = hyp[k] * float(x)  # vary by about 30% 1sigma
 
+            # Apply limits
+            hyp['iou_t'] = np.clip(hyp['iou_t'], 0, 0.90)
+            hyp['momentum'] = np.clip(hyp['momentum'], 0, 0.98)
+            hyp['weight_decay'] = np.clip(hyp['weight_decay'], 0, 0.01)
+
             # Normalize loss components (sum to 1)
             lcf = ['xy', 'wh', 'cls', 'conf']
             s = sum([v for k, v in hyp.items() if k in lcf])