diff --git a/src/addons/network_http.cpp b/src/addons/network_http.cpp
index 569e2e6dc..977197d21 100644
--- a/src/addons/network_http.cpp
+++ b/src/addons/network_http.cpp
@@ -35,7 +35,6 @@
 #include "utils/string_utils.hpp"
 #include "utils/time.hpp"
 #include "utils/translation.hpp"
-#include "utils/vs.hpp"
 
 // ----------------------------------------------------------------------------
 /** Create a thread that handles all network functions independent of the
diff --git a/src/audio/sfx_openal.cpp b/src/audio/sfx_openal.cpp
index fb73fd969..a08d9b63b 100644
--- a/src/audio/sfx_openal.cpp
+++ b/src/audio/sfx_openal.cpp
@@ -25,6 +25,7 @@
 #include "config/user_config.hpp"
 #include "io/file_manager.hpp"
 #include "race/race_manager.hpp"
+#include "utils/vs.hpp"
 
 #ifdef __APPLE__
 #  include <OpenAL/al.h>
@@ -33,16 +34,10 @@
 #endif
 
 #include <assert.h>
+#include <math.h>
 #include <stdio.h>
 #include <string>
 
-#if defined(WIN32) && !defined(__CYGWIN__)  && !defined(__MINGW32__)
-#  define isnan _isnan
-#else
-#  include <math.h>
-#endif
-
-
 SFXOpenAL::SFXOpenAL(SFXBuffer* buffer, bool positional, float gain, bool ownsBuffer) : SFXBase()
 {
     m_soundBuffer = buffer;
diff --git a/src/guiengine/layout_manager.cpp b/src/guiengine/layout_manager.cpp
index ed65a6c17..714a2b7de 100644
--- a/src/guiengine/layout_manager.cpp
+++ b/src/guiengine/layout_manager.cpp
@@ -323,10 +323,10 @@ void LayoutManager::applyCoords(Widget* self, AbstractTopLevelContainer* topLeve
     else if (self->m_relative_y > -1)         self->m_y = (int)(parent_y + parent_h*self->m_relative_y/100);
 
     if (self->m_absolute_w > -1)      self->m_w = self->m_absolute_w;
-    else if (self->m_relative_w > -1) self->m_w = (int)roundf(parent_w*self->m_relative_w/100.0);
+    else if (self->m_relative_w > -1) self->m_w = (int)roundf(parent_w*self->m_relative_w/100.0f);
 
     if (self->m_absolute_h > -1)      self->m_h = self->m_absolute_h;
-    else if (self->m_relative_h > -1) self->m_h = (int)roundf(parent_h*self->m_relative_h/100.0);
+    else if (self->m_relative_h > -1) self->m_h = (int)roundf(parent_h*self->m_relative_h/100.0f);
 
     // ---- can't make widget bigger than parent
     if (self->m_h > (int)parent_h)
diff --git a/src/guiengine/widgets/dynamic_ribbon_widget.cpp b/src/guiengine/widgets/dynamic_ribbon_widget.cpp
index 05f7a53f0..0c408d757 100644
--- a/src/guiengine/widgets/dynamic_ribbon_widget.cpp
+++ b/src/guiengine/widgets/dynamic_ribbon_widget.cpp
@@ -265,8 +265,6 @@ void DynamicRibbonWidget::add()
             assert(m_row_amount != -1);
         }
 
-        // m_row_amount = (int)round((m_h - m_label_height) / (float)m_child_height);
-
         if (m_properties[PROP_MAX_ROWS].size() > 0)
         {
             const int max_rows = atoi(m_properties[PROP_MAX_ROWS].c_str());
diff --git a/src/guiengine/widgets/rating_bar_widget.cpp b/src/guiengine/widgets/rating_bar_widget.cpp
index 3444aed98..e6135d0f4 100644
--- a/src/guiengine/widgets/rating_bar_widget.cpp
+++ b/src/guiengine/widgets/rating_bar_widget.cpp
@@ -19,20 +19,12 @@
 #include "guiengine/modaldialog.hpp"
 #include "guiengine/widgets/rating_bar_widget.hpp"
 #include "utils/string_utils.hpp"
+#include "utils/vs.hpp"
 
 #include <IGUIEnvironment.h>
 #include <IGUIElement.h>
 #include <IGUIButton.h>
 #include <cmath>
-
-#if defined(WIN32) && _MSC_VER < 1800
-// VS up to and including VS 2012 do not provide the normal round function
-static inline float round(float val)
-{    
-    return floor(val + 0.5f);
-}
-#endif
-
 #include <string.h>
 
 using namespace GUIEngine;
@@ -87,7 +79,7 @@ void RatingBarWidget::setStepValues(float float_rating)
             m_star_values[star] = m_steps-1;
         else
         {
-            m_star_values[star] =(int)round((float_rating * (m_steps-1)) - (star*(m_steps-1)));
+            m_star_values[star] =(int)roundf((float_rating * (m_steps-1)) - (star*(m_steps-1)));
         }
     }
 }
@@ -109,7 +101,7 @@ void RatingBarWidget::setStepValuesByMouse(const core::position2di & mouse_posit
         {
             m_hovering = true;
             float exact_hover = (float)(mouse_position.X - stars_rect.UpperLeftCorner.X) / (float)stars_rect.getWidth() * (float)m_stars;
-            m_hover_rating = round(exact_hover * (m_steps-1)) / (m_steps-1);
+            m_hover_rating = roundf(exact_hover * (m_steps-1)) / (m_steps-1);
             setStepValues(m_hover_rating);
         }
         else if(m_hovering)
diff --git a/src/online/http_manager.cpp b/src/online/http_manager.cpp
index e36b1613b..7c65a9f65 100644
--- a/src/online/http_manager.cpp
+++ b/src/online/http_manager.cpp
@@ -30,7 +30,6 @@
 
 #if defined(WIN32) && !defined(__CYGWIN__)
 #  include <windows.h>
-#  define isnan _isnan
 #else
 #  include <sys/time.h>
 #  include <math.h>
diff --git a/src/utils/vs.hpp b/src/utils/vs.hpp
index 68045956b..b97a6a4f4 100644
--- a/src/utils/vs.hpp
+++ b/src/utils/vs.hpp
@@ -1,12 +1,12 @@
-// Visual studio workarounds in one place
+/** Visual studio workarounds in one place
+ *  Note that Visual Studio 2013 does have the maths functions defined,
+ *  so we define the work arounds only for compiler versions before 18.00
+ */
 
-#if defined(_MSC_VER)
-#  include <WinSock2.h>
-#  include <windows.h>
+#if defined(WIN32) && _MSC_VER < 1800
 #  include <math.h>
 
 #  define isnan _isnan
-//#  define round(x) (floor(x + 0.5f))
-#  define roundf(x) (floor(x + 0.5f))
+#  define roundf(x) (floorf(x + 0.5f))
 #endif