2 files changed, 3 insertions, 1 deletions
diff --git a/src/graphicsmanager.cpp b/src/graphicsmanager.cpp
index b230d77cf..f03d784a1 100644
--- a/src/graphicsmanager.cpp
+++ b/src/graphicsmanager.cpp
@@ -784,7 +784,7 @@ void GraphicsManager::detectVideoSettings()
     }
 }
 
-static void debugCallback(GLenum source, GLenum type, GLuint id,
+static CALLBACK void debugCallback(GLenum source, GLenum type, GLuint id,
                           GLenum severity, GLsizei length,
                           const GLchar *text, GLvoid *userParam)
 {
diff --git a/src/mgl.h b/src/mgl.h
index 6f10078a0..f1686a2ba 100644
--- a/src/mgl.h
+++ b/src/mgl.h
@@ -126,6 +126,8 @@ defNameE(glDebugMessageCallback);
 typedef const char* (APIENTRY * wglGetExtensionsString_t) (HDC hdc);
 
 defNameE(wglGetExtensionsString);
+#else
+#define CALLBACK
 #endif
 
 #endif