diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index abc2c3f828c..3ea315d83da 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -4108,7 +4108,7 @@ static NTSTATUS process_init(void)
  */
 NTSTATUS CDECL __wine_set_unix_funcs( int version, const struct unix_funcs *funcs )
 {
-    assert( version == NTDLL_UNIXLIB_VERSION );
+    if (version != NTDLL_UNIXLIB_VERSION) return STATUS_REVISION_MISMATCH;
     unix_funcs = funcs;
     return process_init();
 }
diff --git a/dlls/ntdll/unix/process.c b/dlls/ntdll/unix/process.c
index 6b7cbcd9c1a..083a3a82a1d 100644
--- a/dlls/ntdll/unix/process.c
+++ b/dlls/ntdll/unix/process.c
@@ -701,6 +701,9 @@ done:
     case STATUS_INVALID_IMAGE_NOT_MZ:
         ERR( "%s not supported on this system\n", debugstr_us(&params->ImagePathName) );
         break;
+    case STATUS_REVISION_MISMATCH:
+        ERR( "ntdll library version mismatch\n" );
+        break;
     default:
         ERR( "failed to load %s error %x\n", debugstr_us(&params->ImagePathName), status );
         break;