diff --git a/src/lol/math/vector.h b/src/lol/math/vector.h
index 3bdace44..0206141d 100644
--- a/src/lol/math/vector.h
+++ b/src/lol/math/vector.h
@@ -94,7 +94,13 @@ template<typename T, int N> struct XVec4
     inline T& operator[](int n) { return *(&this->x + n); } \
     inline T const& operator[](int n) const { return *(&this->x + n); } \
     \
-    void printf() const; \
+    /* Visual Studio insists on having an assignment operator. */ \
+    inline tname<T> const & operator =(tname<T> const &that) \
+    { \
+        for (size_t n = 0; n < sizeof(*this) / sizeof(T); n++) \
+            (*this)[n] = that[n]; \
+        return *this; \
+    } \
     \
     template<typename U> \
     inline operator tname<U>() const \
@@ -103,7 +109,9 @@ template<typename T, int N> struct XVec4
         for (size_t n = 0; n < sizeof(*this) / sizeof(T); n++) \
             ret[n] = static_cast<U>((*this)[n]); \
         return ret; \
-    }
+    } \
+    \
+    void printf() const;
 
 /*
  * 2-element vectors
diff --git a/src/vector.cpp b/src/vector.cpp
index 9b8cc1c5..2b67f0da 100644
--- a/src/vector.cpp
+++ b/src/vector.cpp
@@ -312,7 +312,7 @@ template<> quat::Quat(mat4 const &m)
     }
     else if (m[0][0] > m[1][1] && m[0][0] > m[2][2])
     {
-        x = 0.5f * sqrt(1.0f + m[0][0] - m[1][1] - m[2][2]);
+        x = 0.5f * sqrtf(1.0f + m[0][0] - m[1][1] - m[2][2]);
         float s = 0.25f / x;
         y = s * (m[1][0] + m[0][1]);
         z = s * (m[0][2] + m[2][0]);