diff --git a/include/Math.hpp b/include/Math.hpp
index b952f67..c2de7fa 100644
--- a/include/Math.hpp
+++ b/include/Math.hpp
@@ -7,7 +7,7 @@
 #ifndef _USE_MATH_DEFINES
 #define _USE_MATH_DEFINES 1
 #endif
-#include <cmath>
+#include <math.h>
 #include <algorithm>
 
 #include "CVector3f.hpp"
diff --git a/src/Math.cpp b/src/Math.cpp
index 9145d3e..40161c5 100644
--- a/src/Math.cpp
+++ b/src/Math.cpp
@@ -46,8 +46,13 @@ double sqrtD(double val)
     }
     double q;
 #if __SSE__
-    __m128d splat { val };
-    q = _mm_sqrt_pd(splat)[0];
+    union
+    {
+        __m128d v;
+        double d[2];
+    } qv = { val };
+    qv.v = _mm_sqrt_sd(qv.v, qv.v);
+    q = qv.d[0];
 #else
     // le sigh, let's use Carmack's inverse square -.-
     union