diff --git a/backends/platform/symbian/symbian_builder/mmp_gen.py b/backends/platform/symbian/symbian_builder/mmp_gen.py
index f1c836e95a1..f1fd1d6659c 100644
--- a/backends/platform/symbian/symbian_builder/mmp_gen.py
+++ b/backends/platform/symbian/symbian_builder/mmp_gen.py
@@ -199,7 +199,9 @@ def FilterUltima(src):
 
 
 def FilterGrim(src):
+   src += ["#if !defined(WINS)"]
    src += ["SOURCE   movie/codecs/blocky8ARM.s"]
+   src += ["#endif"]
    return src