diff --git a/library/flux_train_utils.py b/library/flux_train_utils.py
index 735bcced..e0d98c0b 100644
--- a/library/flux_train_utils.py
+++ b/library/flux_train_utils.py
@@ -371,7 +371,7 @@ def compute_loss_weighting_for_sd3(weighting_scheme: str, sigmas=None):
 def get_noisy_model_input_and_timesteps(
     args, noise_scheduler, latents, noise, device, dtype
 ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
-    bsz, _, H, W = latents.shape
+    bsz, _, h, w = latents.shape
     sigmas = None
 
     if args.timestep_sampling == "uniform" or args.timestep_sampling == "sigmoid":
@@ -399,7 +399,10 @@ def get_noisy_model_input_and_timesteps(
         logits_norm = torch.randn(bsz, device=device)
         logits_norm = logits_norm * args.sigmoid_scale  # larger scale for more uniform sampling
         timesteps = logits_norm.sigmoid()
-        mu=get_lin_function(y1=0.5, y2=1.15)((H//2) * (W//2))
+        mu = get_lin_function(
+            y1=get_lin_function(args.min_bucket_reso or min(args.resolution)),
+            y2=get_lin_function(args.max_bucket_reso or max(args.resolution)),
+        )((h // 2) * (w // 2))
         timesteps = time_shift(mu, 1.0, timesteps)
 
         t = timesteps.view(-1, 1, 1, 1)