diff --git a/vllm/model_executor/models/whisper.py b/vllm/model_executor/models/whisper.py
index abc903292d9f2..06376c71f33ec 100644
--- a/vllm/model_executor/models/whisper.py
+++ b/vllm/model_executor/models/whisper.py
@@ -534,9 +534,7 @@ class WhisperEncoder(nn.Module):
                     sinusoids(*self.embed_positions.weight.shape)
                 )
 
-    def forward_conv(
-        self, input_features: torch.Tensor | list[torch.Tensor]
-    ) -> torch.Tensor:
+    def forward_conv(self, input_features: torch.Tensor) -> torch.Tensor:
         embeds = nn.functional.gelu(self.conv1(input_features))
         embeds = nn.functional.gelu(self.conv2(embeds))
         embeds = embeds.transpose(-1, -2)
@@ -557,7 +555,7 @@ class WhisperEncoder(nn.Module):
         hidden_states = self.layer_norm(hidden_states)
         return hidden_states
 
-    def forward(self, input_features: torch.Tensor | list[torch.Tensor]):
+    def forward(self, input_features: torch.Tensor):
         hidden_states = self.forward_conv(input_features)
         return self.forward_layers(hidden_states)