diff --git a/reactos/lib/user32/user32.def b/reactos/lib/user32/user32.def
index 66eef33a9ac..aeba54ff8d7 100644
--- a/reactos/lib/user32/user32.def
+++ b/reactos/lib/user32/user32.def
@@ -627,7 +627,7 @@ ShowScrollBar@12
 ;ShowStartGlass
 ShowWindow@8
 ShowWindowAsync@8
-;SoftModalMessageBox
+SoftModalMessageBox@4
 SubtractRect@12
 SwapMouseButton@4
 SwitchDesktop@4
diff --git a/reactos/lib/user32/user32.edf b/reactos/lib/user32/user32.edf
index 00d046b64c3..2eb080b09e8 100644
--- a/reactos/lib/user32/user32.edf
+++ b/reactos/lib/user32/user32.edf
@@ -627,7 +627,7 @@ ShowScrollBar=ShowScrollBar@12
 ;ShowStartGlass
 ShowWindow=ShowWindow@8
 ShowWindowAsync=ShowWindowAsync@8
-;SoftModalMessageBox
+SoftModalMessageBox=SoftModalMessageBox@4
 SubtractRect=SubtractRect@12
 SwapMouseButton=SwapMouseButton@4
 SwitchDesktop=SwitchDesktop@4
diff --git a/reactos/lib/user32/windows/messagebox.c b/reactos/lib/user32/windows/messagebox.c
index ebde3327599..5c23c258cc8 100644
--- a/reactos/lib/user32/windows/messagebox.c
+++ b/reactos/lib/user32/windows/messagebox.c
@@ -16,7 +16,7 @@
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
-/* $Id: messagebox.c,v 1.4 2003/03/16 17:01:45 ea Exp $
+/* $Id: messagebox.c,v 1.5 2003/03/16 17:11:22 ea Exp $
  *
  * PROJECT:         ReactOS user32.dll
  * FILE:            lib/user32/windows/input.c
@@ -95,4 +95,11 @@ MessageBoxW(
 {
   return MessageBoxExW(hWnd, lpText, lpCaption, uType, 0);
 }
+
+DWORD
+STDCALL
+SoftModalMessageBox (DWORD Unknown0)
+{
+	return 0;
+}
 /* EOF */