diff --git a/struct_arm64.go b/struct_arm64.go
index b11983f3..8605e77b 100644
--- a/struct_arm64.go
+++ b/struct_arm64.go
@@ -117,6 +117,8 @@ func placeRegisters(v reflect.Value, addFloat func(uintptr), addInt func(uintptr
 				} else {
 					addInt(uintptr(val))
 				}
+				val = 0
+				class = _NO_CLASS
 			}
 			switch f.Type().Kind() {
 			case reflect.Struct:
diff --git a/struct_test.go b/struct_test.go
index b7347e09..4e3483b3 100644
--- a/struct_test.go
+++ b/struct_test.go
@@ -373,8 +373,9 @@ func TestRegisterFunc_structArgs(t *testing.T) {
 		}
 		var Array4CharsFn func(chars Array4Chars) int32
 		purego.RegisterLibFunc(&Array4CharsFn, lib, "Array4Chars")
-		if ret := Array4CharsFn(Array4Chars{a: [...]int8{100, -127, 4, -100}}); ret != expectedSigned {
-			t.Fatalf("Array4CharsFn returned %#x wanted %#x", ret, expectedSigned)
+		const expectedSum = 1 + 2 + 4 + 8
+		if ret := Array4CharsFn(Array4Chars{a: [...]int8{1, 2, 4, 8}}); ret != expectedSum {
+			t.Fatalf("Array4CharsFn returned %d wanted %d", ret, expectedSum)
 		}
 	}
 	{
@@ -486,6 +487,18 @@ func TestRegisterFunc_structArgs(t *testing.T) {
 			t.Fatalf("FloatAndBool(y: false) = %d, want 0", ret)
 		}
 	}
+	{
+		type FourInt32s struct {
+			f0, f1, f2, f3 int32
+		}
+		var FourInt32sFn func(FourInt32s) int32
+		purego.RegisterLibFunc(&FourInt32sFn, lib, "FourInt32s")
+		result := FourInt32sFn(FourInt32s{100, -127, 4, -100})
+		const want = 100 - 127 + 4 - 100
+		if result != want {
+			t.Fatalf("FourInt32s returned %d wanted %d", result, want)
+		}
+	}
 }
 
 func TestRegisterFunc_structReturns(t *testing.T) {
diff --git a/testdata/structtest/struct_test.c b/testdata/structtest/struct_test.c
index 5769f8d1..4cbf8060 100644
--- a/testdata/structtest/struct_test.c
+++ b/testdata/structtest/struct_test.c
@@ -1,7 +1,9 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2024 The Ebitengine Authors
 
-#include "stdint.h"
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
 
 #if defined(__x86_64__) || defined(__aarch64__)
 typedef int64_t GoInt;
@@ -361,3 +363,14 @@ struct FloatAndBool {
 int FloatAndBool(struct FloatAndBool f) {
     return f.has_value;
 }
+
+struct FourInt32s {
+    int32_t f0;
+    int32_t f1;
+    int32_t f2;
+    int32_t f3;
+};
+
+int32_t FourInt32s(struct FourInt32s s) {
+    return s.f0 + s.f1 + s.f2 + s.f3;
+}