diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index deac2bc1c9..54c3ac8819 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -175,7 +175,7 @@ void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data,
 // from pngerror.c
 // so that the libpng doesn't send anything on stderr
 void
-PNGLINKAGEMODE wx_png_error(png_structp png_ptr, png_const_charp message)
+PNGLINKAGEMODE wx_png_error(png_structp WXUNUSED(png_ptr), png_const_charp message)
 {
     wxLogFatalError( wxString::FromAscii(message) );
 }
diff --git a/src/common/prntbase.cpp b/src/common/prntbase.cpp
index e1f655959f..e0a3bbf3a5 100644
--- a/src/common/prntbase.cpp
+++ b/src/common/prntbase.cpp
@@ -171,8 +171,12 @@ bool wxNativePrintFactory::HasPrintSetupDialog()
 wxDialog *wxNativePrintFactory::CreatePrintSetupDialog( wxWindow *parent, wxPrintData *data )
 {
 #if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
+    wxUnusedVar(parent);
+    wxUnusedVar(data);
     return NULL;
 #elif defined(__WXMAC__)
+    wxUnusedVar(parent);
+    wxUnusedVar(data);
     return NULL;
 #else
     // Only here do we need to provide the print setup