diff --git a/src/modules/audio_processing/aec/main/source/aec_rdft.h b/src/modules/audio_processing/aec/main/source/aec_rdft.h
index 5f4085bdb2..91bedc9fc7 100644
--- a/src/modules/audio_processing/aec/main/source/aec_rdft.h
+++ b/src/modules/audio_processing/aec/main/source/aec_rdft.h
@@ -11,6 +11,14 @@
 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_RDFT_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC_MAIN_SOURCE_AEC_RDFT_H_
 
+// These intrinsics were unavailable before VS 2008.
+// TODO(andrew): move to a common file.
+#if defined(_MSC_VER) && _MSC_VER < 1500
+#include <emmintrin.h>
+static __inline __m128 _mm_castsi128_ps(__m128i a) { return *(__m128*)&a; }
+static __inline __m128i _mm_castps_si128(__m128 a) { return *(__m128i*)&a; }
+#endif
+
 #ifdef _MSC_VER /* visual c++ */
 # define ALIGN16_BEG __declspec(align(16))
 # define ALIGN16_END
diff --git a/src/typedefs.h b/src/typedefs.h
index 58952336ef..ca3b509c00 100644
--- a/src/typedefs.h
+++ b/src/typedefs.h
@@ -80,10 +80,7 @@
 #error Please add support for your architecture in typedefs.h
 #endif
 
-// TODO(andrew): Enable on Windows. Temporarily disabled again until we can
-// build on VS 2005...
-//#if defined(__SSE2__) || defined(_MSC_VER)
-#if defined(__SSE2__)
+#if defined(__SSE2__) || defined(_MSC_VER)
 #define WEBRTC_USE_SSE2
 #endif