diff --git a/dlls/shell32/shell32.spec b/dlls/shell32/shell32.spec
index 5f5346c5c1c..0f7d28a5d79 100644
--- a/dlls/shell32/shell32.spec
+++ b/dlls/shell32/shell32.spec
@@ -163,7 +163,7 @@ debug_channels (exec pidl shell shlctrl)
  155 stdcall ILFree (ptr) ILFree
  156 stdcall ILGlobalFree (ptr) ILGlobalFree
  157 stdcall ILCreateFromPath (ptr) ILCreateFromPathAW
- 158 stdcall PathGetExtension(str) PathGetExtensionAW
+ 158 stdcall PathGetExtension(str long long) PathGetExtensionAW
  159 stdcall PathIsDirectory(ptr)PathIsDirectoryAW
  160 stub SHNetConnectionDialog
  161 stdcall SHRunControlPanel (long long) SHRunControlPanel
diff --git a/dlls/shell32/shellpath.c b/dlls/shell32/shellpath.c
index befbfa0c437..7ab5f1d6fe8 100644
--- a/dlls/shell32/shellpath.c
+++ b/dlls/shell32/shellpath.c
@@ -122,7 +122,7 @@ static LPWSTR PathGetExtensionW(LPCWSTR lpszPath)
 /*************************************************************************
  * PathGetExtension		[SHELL32.158]
  */
-LPVOID WINAPI PathGetExtensionAW(LPCVOID lpszPath) 
+LPVOID WINAPI PathGetExtensionAW(LPCVOID lpszPath,DWORD void1, DWORD void2) 
 {
 	if (SHELL_OsIsUnicode())
 	  return PathGetExtensionW(lpszPath);
diff --git a/include/wine/undocshell.h b/include/wine/undocshell.h
index a96a962e2be..31d80fac212 100644
--- a/include/wine/undocshell.h
+++ b/include/wine/undocshell.h
@@ -543,7 +543,7 @@ LPVOID WINAPI PathFindExtensionAW(LPCVOID path);
 
 LPVOID WINAPI PathFindFileNameAW(LPCVOID path); 
 
-LPVOID WINAPI PathGetExtensionAW(LPCVOID lpszPath); 
+LPVOID WINAPI PathGetExtensionAW(LPCVOID lpszPath,  DWORD void1, DWORD void2); 
 
 LPVOID WINAPI PathGetArgsAW(LPVOID lpszPath);