diff --git a/adv_control/utils.py b/adv_control/utils.py
index 2d380ed..1ace23a 100644
--- a/adv_control/utils.py
+++ b/adv_control/utils.py
@@ -359,7 +359,7 @@ def prepare_mask_batch(mask: Tensor, shape: Tensor, multiplier: int=1, match_dim
     mask = mask.clone()
     if flux_shape is not None:
         multiplier = multiplier * 0.5
-        mask = torch.nn.functional.interpolate(mask.reshape((-1, 1, mask.shape[-2], mask.shape[-1])), size=(round(flux_shape[-2]*multiplier), round(flux_shape[-1]*multiplier)), mode="bilinear")
+        mask = torch.nn.functional.interpolate(mask.reshape((-1, 1, mask.shape[-2], mask.shape[-1])), size=(math.ceil(flux_shape[-2]*multiplier), math.ceil(flux_shape[-1]*multiplier)), mode="bilinear")
         mask = rearrange(mask, "b c h w -> b (h w) c")
     else:
         mask = torch.nn.functional.interpolate(mask.reshape((-1, 1, mask.shape[-2], mask.shape[-1])), size=(round(shape[-2]*multiplier), round(shape[-1]*multiplier)), mode="bilinear")
diff --git a/tests/test_modern_control.py b/tests/test_modern_control.py
index b4b173a..7ca4f70 100644
--- a/tests/test_modern_control.py
+++ b/tests/test_modern_control.py
@@ -63,6 +63,20 @@ class ModernControlPreprocessingTests(unittest.TestCase):
         )
         torch.testing.assert_close(output, expected)
 
+    def test_effect_mask_matches_padded_flux_tokens_for_odd_latent_size(self):
+        control = ControlNetAdvanced(ControlModel(), None)
+        control.x_noisy_shape = (1, 16, 5, 7)
+        control.mask_cond_hint = torch.ones((1, 1, 5, 7))
+        control.tk_mask_cond_hint = None
+        control.weights = SimpleNamespace(has_uncond_multiplier=False, has_uncond_mask=False)
+        control.latent_keyframes = None
+        control._current_timestep_keyframe = SimpleNamespace(strength=1.0)
+
+        output = torch.ones((1, 12, 4))
+        control.apply_advanced_strengths_and_masks(output, batched_number=1)
+
+        torch.testing.assert_close(output, torch.ones_like(output))
+
     def test_vae_compression_and_source_mask_match_5d_hint(self):
         control_model = ControlModel()
         vae = VideoVAE()