diff --git a/include/wx/gtk/dc.h b/include/wx/gtk/dc.h
index 6c8fb391e3..de09ee2494 100644
--- a/include/wx/gtk/dc.h
+++ b/include/wx/gtk/dc.h
@@ -32,9 +32,14 @@ public:
     virtual bool DoStretchBlit(int xdest, int ydest, int dstWidth, int dstHeight, wxDC* source, int xsrc, int ysrc, int srcWidth, int srcHeight, wxRasterOperationMode rop, bool useMask, int xsrcMask, int ysrcMask) wxOVERRIDE;
     virtual void* GetCairoContext() const wxOVERRIDE;
 
+    virtual wxSize GetPPI() const wxOVERRIDE;
+
 protected:
     int m_width, m_height;
 
+private:
+    bool TryGetWindowSize(wxSize& size, wxSize& sizeMM) const;
+
     wxDECLARE_NO_COPY_CLASS(wxGTKCairoDCImpl);
 };
 //-----------------------------------------------------------------------------
diff --git a/src/gtk/dc.cpp b/src/gtk/dc.cpp
index 711b96d517..ed846c0899 100644
--- a/src/gtk/dc.cpp
+++ b/src/gtk/dc.cpp
@@ -15,6 +15,7 @@
 #include "wx/dcclient.h"
 #include "wx/dcmemory.h"
 #include "wx/dcscreen.h"
+#include "wx/gdicmn.h"
 #include "wx/icon.h"
 #include "wx/gtk/dc.h"
 
@@ -237,6 +238,18 @@ void* wxGTKCairoDCImpl::GetCairoContext() const
     return cr;
 }
 
+wxSize wxGTKCairoDCImpl::GetPPI() const
+{
+    if ( m_window )
+    {
+        return wxGetDisplayPPI();
+    }
+
+    // For a non-window-based DC the concept of PPI doesn't make much sense
+    // anyhow, so just return the hardcoded value used by the base class.
+    return wxGCDCImpl::GetPPI();
+}
+
 //-----------------------------------------------------------------------------
 
 wxWindowDCImpl::wxWindowDCImpl(wxWindowDC* owner, wxWindow* window)