diff --git a/src/BREPExport/BREPExport.cxx b/src/BREPExport/BREPExport.cxx
index 6c125cac0..7bd879a3a 100644
--- a/src/BREPExport/BREPExport.cxx
+++ b/src/BREPExport/BREPExport.cxx
@@ -58,8 +58,9 @@
 
 extern "C"
 {
-BREPEXPORT_EXPORT
-  int Export(const TopoDS_Shape& theShape, const TCollection_AsciiString& theFileName)
+  BREPEXPORT_EXPORT int Export (const TopoDS_Shape& theShape,
+                                const TCollection_AsciiString& theFileName,
+                                const TCollection_AsciiString& /*theFormatName*/)
   {
     MESSAGE("Export BREP into file " << theFileName.ToCString());
 
diff --git a/src/STEPExport/STEPExport.cxx b/src/STEPExport/STEPExport.cxx
index abe5c310a..e911cd01e 100644
--- a/src/STEPExport/STEPExport.cxx
+++ b/src/STEPExport/STEPExport.cxx
@@ -61,8 +61,9 @@
 
 extern "C"
 {
-  STEPEXPORT_EXPORT
-  int Export(const TopoDS_Shape& theShape, const TCollection_AsciiString& theFileName)
+  STEPEXPORT_EXPORT int Export (const TopoDS_Shape& theShape,
+                                const TCollection_AsciiString& theFileName,
+                                const TCollection_AsciiString& /*theFormatName*/)
   {
     MESSAGE("Export STEP into file " << theFileName.ToCString());