diff --git a/Eigen/Core b/Eigen/Core
index 143affc76..45ab7f5d3 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -306,6 +306,7 @@ using std::ptrdiff_t;
   // Use AVX for floats and doubles, SSE for integers
   #include "src/Core/arch/SSE/PacketMath.h"
   #include "src/Core/arch/SSE/Complex.h"
+  #include "src/Core/arch/SSE/MathFunctions.h"
   #include "src/Core/arch/AVX/PacketMath.h"
   #include "src/Core/arch/AVX/MathFunctions.h"
   #include "src/Core/arch/AVX/Complex.h"
diff --git a/Eigen/src/Core/arch/AVX/PacketMath.h b/Eigen/src/Core/arch/AVX/PacketMath.h
index 4dda35b41..9f275a380 100644
--- a/Eigen/src/Core/arch/AVX/PacketMath.h
+++ b/Eigen/src/Core/arch/AVX/PacketMath.h
@@ -60,7 +60,7 @@ template<> struct packet_traits<float>  : default_packet_traits
     HasHalfPacket = 1,
 
     HasDiv  = 1,
-    HasSin  = 1,
+    HasSin  = EIGEN_FAST_MATH,
     HasCos  = 0,
     HasLog  = 1,
     HasExp  = 1,