diff --git a/include/RAJA/policy/atomic_builtin.hpp b/include/RAJA/policy/atomic_builtin.hpp
index 34755fa49d..e43bd71386 100644
--- a/include/RAJA/policy/atomic_builtin.hpp
+++ b/include/RAJA/policy/atomic_builtin.hpp
@@ -22,7 +22,7 @@
 
 #include <cstdint>
 
-#if defined(RAJA_COMPILER_MSVC) || (defined(_WIN32) && defined(__INTEL_COMPILER))
+#if defined(RAJA_COMPILER_MSVC) || ((defined(_WIN32) || defined(_WIN64)) && defined(__INTEL_COMPILER))
 #include <intrin.h>
 #endif
 
@@ -48,7 +48,7 @@ struct builtin_atomic {
 namespace detail {
 
 
-#if defined(RAJA_COMPILER_MSVC) || (defined(_WIN32) && defined(__INTEL_COMPILER))
+#if defined(RAJA_COMPILER_MSVC) || ((defined(_WIN32) || defined(_WIN64)) && defined(__INTEL_COMPILER))
 
 
 /*!
@@ -120,11 +120,14 @@ RAJA_INLINE long builtin_atomicOr(long *acc, long value)
   return _InterlockedOr(acc, value);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicOr(long long *acc, long long value)
 {
   return _InterlockedOr64(acc, value);
 }
 
+#endif
 
 /*!
  * Atomic load using atomic or
@@ -155,11 +158,15 @@ RAJA_INLINE long builtin_atomicExchange(long *acc, long value)
   return _InterlockedExchange(acc, value);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicExchange(long long *acc, long long value)
 {
   return _InterlockedExchange64(acc, value);
 }
 
+#endif
+
 
 /*!
  * Atomic store using atomic exchange
@@ -190,11 +197,15 @@ RAJA_INLINE long builtin_atomicCAS(long *acc, long compare, long value)
   return _InterlockedCompareExchange(acc, value, compare);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicCAS(long long *acc, long long compare, long long value)
 {
   return _InterlockedCompareExchange64(acc, value, compare);
 }
 
+#endif
+
 
 /*!
  * Atomic addition using intrinsics
@@ -214,11 +225,15 @@ RAJA_INLINE long builtin_atomicAdd(long *acc, long value)
   return _InterlockedExchangeAdd(acc, value);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicAdd(long long *acc, long long value)
 {
   return _InterlockedExchangeAdd64(acc, value);
 }
 
+#endif
+
 
 /*!
  * Atomic subtraction using intrinsics
@@ -238,11 +253,15 @@ RAJA_INLINE long builtin_atomicSub(long *acc, long value)
   return _InterlockedExchangeAdd(acc, -value);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicSub(long long *acc, long long value)
 {
   return _InterlockedExchangeAdd64(acc, -value);
 }
 
+#endif
+
 
 /*!
  * Atomic and using intrinsics
@@ -262,11 +281,15 @@ RAJA_INLINE long builtin_atomicAnd(long *acc, long value)
   return _InterlockedAnd(acc, value);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicAnd(long long *acc, long long value)
 {
   return _InterlockedAnd64(acc, value);
 }
 
+#endif
+
 
 /*!
  * Atomic xor using intrinsics
@@ -286,11 +309,15 @@ RAJA_INLINE long builtin_atomicXor(long *acc, long value)
   return _InterlockedXor(acc, value);
 }
 
+#if defined(_WIN64)
+
 RAJA_INLINE long long builtin_atomicXor(long long *acc, long long value)
 {
   return _InterlockedXor64(acc, value);
 }
 
+#endif
+
 
 #else  // RAJA_COMPILER_MSVC