diff --git a/win32/win32.c b/win32/win32.c
index 7ddfdeb563..1ca677b8dc 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -5872,7 +5872,7 @@ ustatfs(const char *path, struct statfs *buf)
     WCHAR root[MAX_PATH], system[8];
     DWORD serial, spc, bps, unused, total;
     char *tmp;
-    BOOL WINAPI GetVolumePathNameW(LPCWSTR, LPWSTR, DWORD);
+    WINBASEAPI BOOL WINAPI GetVolumePathNameW(LPCWSTR, LPWSTR, DWORD);
 
     if (!wpath) {
 	return -1;