diff --git a/include/wx/gtk/mimetype.h b/include/wx/gtk/mimetype.h
index fe424e4230..ed645c6de3 100644
--- a/include/wx/gtk/mimetype.h
+++ b/include/wx/gtk/mimetype.h
@@ -25,8 +25,6 @@ class WXDLLIMPEXP_CORE wxGTKMimeTypesManagerImpl : public wxMimeTypesManagerImpl
 protected:
 #if defined(__UNIX__)
     wxString GetIconFromMimeType(const wxString& mime) wxOVERRIDE;
-#else
-    wxString GetIconFromMimeType(const wxString& mime);
 #endif
 };
 
diff --git a/src/gtk/mimetype.cpp b/src/gtk/mimetype.cpp
index 000d44632d..105842ce7a 100644
--- a/src/gtk/mimetype.cpp
+++ b/src/gtk/mimetype.cpp
@@ -19,6 +19,7 @@
 #include "wx/gtk/private/string.h"
 #include "wx/gtk/private/object.h"
 
+#if defined(__UNIX__)
 wxString wxGTKMimeTypesManagerImpl::GetIconFromMimeType(const wxString& mime)
 {
     wxString icon;
@@ -58,6 +59,7 @@ wxString wxGTKMimeTypesManagerImpl::GetIconFromMimeType(const wxString& mime)
 #endif // GTK_CHECK_VERSION(2,14,0)
     return icon;
 }
+#endif // defined(__UNIX__)
 
 wxMimeTypesManagerImpl *wxGTKMimeTypesManagerFactory::CreateMimeTypesManagerImpl()
 {