diff --git a/src/common/imagpng.cpp b/src/common/imagpng.cpp
index ca4e72c240..fcb4b0a0e6 100644
--- a/src/common/imagpng.cpp
+++ b/src/common/imagpng.cpp
@@ -105,7 +105,7 @@ IMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler)
 #if wxUSE_STREAMS
 
 #ifndef PNGLINKAGEMODE
-    #if defined(__WATCOMC__) && defined(__WXMSW__)
+    #if defined(__WATCOMC__) && ( defined(__WXMSW__) || defined(__WXMGL__) )
         // we need an explicit cdecl for Watcom, at least according to
         //
         // http://sf.net/tracker/index.php?func=detail&aid=651492&group_id=9863&atid=109863
diff --git a/src/common/imagtiff.cpp b/src/common/imagtiff.cpp
index 8c7d45a6fb..4c09339ca7 100644
--- a/src/common/imagtiff.cpp
+++ b/src/common/imagtiff.cpp
@@ -34,7 +34,11 @@ extern "C"
 #include "wx/module.h"
 
 #ifndef TIFFLINKAGEMODE
-  #define TIFFLINKAGEMODE LINKAGEMODE
+  #if defined(__WATCOMC__) && defined(__WXMGL__)
+    #define TIFFLINKAGEMODE cdecl
+  #else
+    #define TIFFLINKAGEMODE LINKAGEMODE
+  #endif
 #endif
 
 //-----------------------------------------------------------------------------