diff --git a/yg/internal/opengl_win32.cpp b/yg/internal/opengl_win32.cpp
index 737e376275..350c2d8bc3 100644
--- a/yg/internal/opengl_win32.cpp
+++ b/yg/internal/opengl_win32.cpp
@@ -28,11 +28,12 @@ PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT;
 PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT;
 PFNGLMAPBUFFERPROC glMapBuffer;
 PFNGLUNMAPBUFFERPROC glUnmapBuffer;
+PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT;
 
 namespace win32
 {
   template <class TRet>
-  TRet GetGLProc(HMODULE hInst, char const * name)
+  TRet GetGLProc(HMODULE, char const * name)
   {
     PROC p = ::wglGetProcAddress(name);
     if (p == 0)
@@ -67,6 +68,7 @@ namespace win32
     glUnmapBuffer = GetGLProc<PFNGLUNMAPBUFFERPROC>(hInst, "glUnmapBuffer");
     glBlitFramebuffer = GetGLProc<PFNGLBLITFRAMEBUFFERPROC>(hInst, "glBlitFramebuffer");
     glRenderbufferStorageMultisample = GetGLProc<PFNGLRENDERBUFFERSTORAGEMULTISAMPLEPROC>(hInst, "glRenderbufferStorageMultisample");
+    glCheckFramebufferStatusEXT = GetGLProc<PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC>(hInst, "glCheckFramebufferStatusEXT");
   }
 }
 
diff --git a/yg/internal/opengl_win32.hpp b/yg/internal/opengl_win32.hpp
index 932078e820..40f01333e5 100644
--- a/yg/internal/opengl_win32.hpp
+++ b/yg/internal/opengl_win32.hpp
@@ -28,6 +28,7 @@ extern PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT;
 extern PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT;
 extern PFNGLMAPBUFFERPROC glMapBuffer;
 extern PFNGLUNMAPBUFFERPROC glUnmapBuffer;
+extern PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT;
 
 namespace win32
 {