diff --git a/include/xvec/x86/permute.hpp b/include/xvec/x86/permute.hpp
index ba13735..4af0046 100644
--- a/include/xvec/x86/permute.hpp
+++ b/include/xvec/x86/permute.hpp
@@ -89,7 +89,7 @@ inline auto permute_x86_register(x86_avx2_tag, const basic_vec<_Tp, _AbiT>& v, c
   // same size. There is no advantage to using 128-bit permute instructions.
   const auto _rv = permute<vec<_Tp>::size()>(v, perm_uninitResize);
 
-  auto impl = [_rv]<typename _ImplT>(_ImplT i) -> _ImplT {
+  auto impl = [_rv]<typename _ImplT>(_ImplT i) {
     auto block = permute<vec<_Tp>::size>(i, perm_uninitResize); // Bump to whole register
 
     auto r = [=]{
diff --git a/test/TestSimdPermute.cpp b/test/TestSimdPermute.cpp
index f02f257..5556613 100644
--- a/test/TestSimdPermute.cpp
+++ b/test/TestSimdPermute.cpp
@@ -159,7 +159,8 @@ BOOST_AUTO_TEST_CASE_TEMPLATE(BySmallIndex, TypeParam, PermuteTestTypes)
   {
     using UnsignedIndexSimd = xvec::simd::vec<unsigned short, 5>;
     const auto unsignedIndexes = GetRandomVector<UnsignedIndexSimd>(TypeParam::size() - 1);
-    const auto signedIndexes = xvec::rebind_cast<signed short>(unsignedIndexes);
+    const auto signedIndexes1 = xvec::rebind_cast<signed short>(unsignedIndexes);
+    const auto signedIndexes2 = xvec::rebind_cast<signed int>(unsignedIndexes);
 
     std::array<typename TypeParam::value_type, 5> expected{};
     for (std::size_t i = 0; i < expected.size(); ++i)
@@ -168,13 +169,13 @@ BOOST_AUTO_TEST_CASE_TEMPLATE(BySmallIndex, TypeParam, PermuteTestTypes)
     const auto computedOptionUnsignedA = permute(f.v0, unsignedIndexes);
     BOOST_TEST(to_array(computedOptionUnsignedA) == expected, boost::test_tools::per_element());
 
-    const auto computedOptionSignedA = permute(f.v0, signedIndexes);
+    const auto computedOptionSignedA = permute(f.v0, signedIndexes1);
     BOOST_TEST(to_array(computedOptionSignedA) == expected, boost::test_tools::per_element());
 
     const auto computedOptionUnsignedB = f.v0[unsignedIndexes];
     BOOST_TEST(to_array(computedOptionUnsignedB) == expected, boost::test_tools::per_element());
 
-    const auto computedOptionSignedB = f.v0[signedIndexes];
+    const auto computedOptionSignedB = f.v0[signedIndexes2];
     BOOST_TEST(to_array(computedOptionSignedB) == expected, boost::test_tools::per_element());
 
 #if defined(_XVEC_HAS_CONSTEXPR)