diff --git a/Vc/avx/vector.h b/Vc/avx/vector.h
index 8f9a5da34..240406d42 100644
--- a/Vc/avx/vector.h
+++ b/Vc/avx/vector.h
@@ -94,6 +94,7 @@ template <typename T> class Vector<T, VectorAbi::Avx>
         static constexpr size_t Size = sizeof(VectorType) / sizeof(EntryType);
         static constexpr size_t MemoryAlignment = alignof(VectorType);
     using IndexType = fixed_size_simd<int, Size>;
+    using index_type = IndexType;
         typedef Vector<T, abi> AsArg;
         typedef VectorType VectorTypeArg;
 
diff --git a/Vc/scalar/vector.h b/Vc/scalar/vector.h
index e7fa7fa8f..f4bda6edf 100644
--- a/Vc/scalar/vector.h
+++ b/Vc/scalar/vector.h
@@ -76,6 +76,7 @@ template <typename T> class Vector<T, VectorAbi::Scalar>
         static constexpr size_t Size = 1;
         static constexpr size_t MemoryAlignment = alignof(VectorType);
         using IndexType = fixed_size_simd<int, 1>;
+        using index_type = IndexType;
 
 #include "../common/generalinterface.h"
 
diff --git a/Vc/sse/vector.h b/Vc/sse/vector.h
index 42905f0e0..a83c773fc 100644
--- a/Vc/sse/vector.h
+++ b/Vc/sse/vector.h
@@ -79,6 +79,7 @@ template <typename T> class Vector<T, VectorAbi::Sse>
         using value_type = EntryType;
         using VectorEntryType = EntryType;
         using IndexType = fixed_size_simd<int, Size>;
+        using index_type = IndexType;
         typedef typename SSE::VectorTraits<T>::MaskType Mask;
         using MaskType = Mask;
         using mask_type = Mask;