diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index 2cca90ac952..8a1e35b6387 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -660,7 +660,7 @@ void *get_builtin_so_handle( void *module )
 /***********************************************************************
  *           get_builtin_unix_funcs
  */
-NTSTATUS get_builtin_unix_funcs( void *module, BOOL wow, void **funcs )
+static NTSTATUS get_builtin_unix_funcs( void *module, BOOL wow, void **funcs )
 {
     const char *ptr_name = wow ? "__wine_unix_call_wow64_funcs" : "__wine_unix_call_funcs";
     sigset_t sigset;