diff --git a/narwhals/_arrow/expr.py b/narwhals/_arrow/expr.py
index 5868a33a1..c93ba3b91 100644
--- a/narwhals/_arrow/expr.py
+++ b/narwhals/_arrow/expr.py
@@ -89,7 +89,7 @@ def __mul__(self, other: ArrowExpr | Any) -> Self:
     def mean(self) -> Self:
         return reuse_series_implementation(self, "mean", returns_scalar=True)
 
-    def count(self) -> Self:
+    def count(self) -> int:
         return reuse_series_implementation(self, "count", returns_scalar=True)
 
     def std(self, ddof: int = 1) -> Self: