diff --git a/python/extrules.am b/python/extrules.am
index 0b81577b9..18a7a9497 100644
--- a/python/extrules.am
+++ b/python/extrules.am
@@ -1,6 +1,4 @@
 swig : gribapi_swig.i
-	p4 edit swig_wrap_numpy.c swig_wrap_numpy.py swig_wrap_array.c swig_wrap_array.py
-
 	swig -python -module gribapi_swig -DNUMPY -o swig_wrap_numpy.c gribapi_swig.i
 	cp gribapi_swig.py swig_wrap_numpy.py