diff --git a/src/filter/Filter.hxx b/src/filter/Filter.hxx
index 6864cec1a..ba68c9266 100644
--- a/src/filter/Filter.hxx
+++ b/src/filter/Filter.hxx
@@ -65,7 +65,7 @@ public:
 
 	/**
 	 * Flush pending data and return it.  This should be called
-	 * repepatedly until it returns nullptr.
+	 * repeatedly until it returns nullptr.
 	 */
 	virtual ConstBuffer<void> Flush();
 };
diff --git a/src/filter/plugins/AutoConvertFilterPlugin.cxx b/src/filter/plugins/AutoConvertFilterPlugin.cxx
index a55081744..239814a9f 100644
--- a/src/filter/plugins/AutoConvertFilterPlugin.cxx
+++ b/src/filter/plugins/AutoConvertFilterPlugin.cxx
@@ -55,6 +55,7 @@ public:
 	}
 
 	ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
+	ConstBuffer<void> Flush() override;
 };
 
 class PreparedAutoConvertFilter final : public PreparedFilter {
@@ -103,6 +104,18 @@ AutoConvertFilter::FilterPCM(ConstBuffer<void> src)
 	return filter->FilterPCM(src);
 }
 
+ConstBuffer<void>
+AutoConvertFilter::Flush()
+{
+	if (convert != nullptr) {
+		auto result = convert->Flush();
+		if (!result.IsNull())
+			return filter->FilterPCM(result);
+	}
+
+	return filter->Flush();
+}
+
 std::unique_ptr<PreparedFilter>
 autoconvert_filter_new(std::unique_ptr<PreparedFilter> filter) noexcept
 {