diff --git a/Grid/Makefile.am b/Grid/Makefile.am
index ded6d146..8b3c07bf 100644
--- a/Grid/Makefile.am
+++ b/Grid/Makefile.am
@@ -54,7 +54,7 @@ Version.h: version-cache
 include Make.inc
 include Eigen.inc
 
-extra_sources+=$(ZWILS_FERMION_FILES)
+#extra_sources+=$(ZWILS_FERMION_FILES)
 extra_sources+=$(WILS_FERMION_FILES)
 extra_sources+=$(STAG_FERMION_FILES)
 if BUILD_GPARITY