diff --git a/src/diffusers/pipelines/wan/pipeline_wan.py b/src/diffusers/pipelines/wan/pipeline_wan.py
index 362440c8c9c8..e77a3356b883 100644
--- a/src/diffusers/pipelines/wan/pipeline_wan.py
+++ b/src/diffusers/pipelines/wan/pipeline_wan.py
@@ -496,8 +496,13 @@ def __call__(
             num_frames = num_frames // self.vae_scale_factor_temporal * self.vae_scale_factor_temporal + 1
         num_frames = max(num_frames, 1)
 
-        h_multiple_of = self.vae_scale_factor_spatial * self.transformer.config.patch_size[1]
-        w_multiple_of = self.vae_scale_factor_spatial * self.transformer.config.patch_size[2]
+        patch_size = (
+            self.transformer.config.patch_size
+            if self.transformer is not None
+            else self.transformer_2.config.patch_size
+        )
+        h_multiple_of = self.vae_scale_factor_spatial * patch_size[1]
+        w_multiple_of = self.vae_scale_factor_spatial * patch_size[2]
         calc_height = height // h_multiple_of * h_multiple_of
         calc_width = width // w_multiple_of * w_multiple_of
         if height != calc_height or width != calc_width:
diff --git a/src/diffusers/pipelines/wan/pipeline_wan_i2v.py b/src/diffusers/pipelines/wan/pipeline_wan_i2v.py
index e22d8393bd1a..c1c4a92c2c39 100644
--- a/src/diffusers/pipelines/wan/pipeline_wan_i2v.py
+++ b/src/diffusers/pipelines/wan/pipeline_wan_i2v.py
@@ -637,8 +637,13 @@ def __call__(
             num_frames = num_frames // self.vae_scale_factor_temporal * self.vae_scale_factor_temporal + 1
         num_frames = max(num_frames, 1)
 
-        h_multiple_of = self.vae_scale_factor_spatial * self.transformer.config.patch_size[1]
-        w_multiple_of = self.vae_scale_factor_spatial * self.transformer.config.patch_size[2]
+        patch_size = (
+            self.transformer.config.patch_size
+            if self.transformer is not None
+            else self.transformer_2.config.patch_size
+        )
+        h_multiple_of = self.vae_scale_factor_spatial * patch_size[1]
+        w_multiple_of = self.vae_scale_factor_spatial * patch_size[2]
         calc_height = height // h_multiple_of * h_multiple_of
         calc_width = width // w_multiple_of * w_multiple_of
         if height != calc_height or width != calc_width: