diff --git a/src/libImaging/ImPlatform.h b/src/libImaging/ImPlatform.h
index e7feff9b5..a122fea21 100644
--- a/src/libImaging/ImPlatform.h
+++ b/src/libImaging/ImPlatform.h
@@ -9,19 +9,6 @@
 
 #include "Python.h"
 
-/* Microsoft compiler doesn't limit intrinsics for an architecture.
-   This macro is set only on x86 and means SSE2 and above including AVX2. */
-#if defined(_M_X64) || _M_IX86_FP == 2
-    #define __SSE4_2__
-#endif
-#if defined(__SSE4_2__)
-    #include <emmintrin.h>
-    #include <mmintrin.h>
-    #include <smmintrin.h>
-#endif
-#if defined(__AVX2__)
-    #include <immintrin.h>
-#endif
 
 /* Check that we have an ANSI compliant compiler */
 #ifndef HAVE_PROTOTYPES
@@ -98,3 +85,5 @@ typedef signed __int64 int64_t;
 #ifdef __GNUC__
 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
 #endif
+
+#include "ImagingSIMD.h"
diff --git a/src/libImaging/ImagingSIMD.h b/src/libImaging/ImagingSIMD.h
new file mode 100644
index 000000000..d082837d1
--- /dev/null
+++ b/src/libImaging/ImagingSIMD.h
@@ -0,0 +1,27 @@
+/* Microsoft compiler doesn't limit intrinsics for an architecture.
+   This macro is set only on x86 and means SSE2 and above including AVX2. */
+#if defined(_M_X64) || _M_IX86_FP == 2
+    #define __SSE4_2__
+#endif
+#if defined(__SSE4_2__)
+    #include <emmintrin.h>
+    #include <mmintrin.h>
+    #include <smmintrin.h>
+#endif
+#if defined(__AVX2__)
+    #include <immintrin.h>
+#endif
+
+#if defined(__SSE4_2__)
+static __m128i inline
+mm_cvtepu8_epi32(void *ptr) {
+    return _mm_cvtepu8_epi32(_mm_cvtsi32_si128(*(INT32 *) ptr));
+}
+#endif
+
+#if defined(__AVX2__)
+static __m256i inline
+mm256_cvtepu8_epi32(void *ptr) {
+    return _mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i *) ptr));
+}
+#endif
diff --git a/src/libImaging/ImagingUtils.h b/src/libImaging/ImagingUtils.h
index ba6210886..0c0c1eda9 100644
--- a/src/libImaging/ImagingUtils.h
+++ b/src/libImaging/ImagingUtils.h
@@ -40,18 +40,3 @@ static float __attribute__((always_inline)) inline _i2f(int v) {
 #else
 static float inline _i2f(int v) { return (float)v; }
 #endif
-
-
-#if defined(__SSE4_2__)
-static __m128i inline
-mm_cvtepu8_epi32(void *ptr) {
-    return _mm_cvtepu8_epi32(_mm_cvtsi32_si128(*(INT32 *) ptr));
-}
-#endif
-
-#if defined(__AVX2__)
-static __m256i inline
-mm256_cvtepu8_epi32(void *ptr) {
-    return _mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i *) ptr));
-}
-#endif