diff --git a/torch_geometric/edge_index.py b/torch_geometric/edge_index.py
index 248dc534f7dd..327f17689172 100644
--- a/torch_geometric/edge_index.py
+++ b/torch_geometric/edge_index.py
@@ -1667,7 +1667,7 @@ def matmul(
         sparse_input = sparse_input.t()
 
     if torch_geometric.typing.WITH_WINDOWS:  # pragma: no cover
-        other = other.to_sparse_coo(input_value)
+        other = other.to_sparse_coo(other_value)
     elif other.is_sorted_by_col:
         other = other.to_sparse_csc(other_value)
     else: