diff --git a/sysa/mes-0.24/mes-0.24.kaem b/sysa/mes-0.24/mes-0.24.kaem
index 3a95abc..f85043f 100755
--- a/sysa/mes-0.24/mes-0.24.kaem
+++ b/sysa/mes-0.24/mes-0.24.kaem
@@ -34,6 +34,9 @@ cp ../files/config.h ${MES_PREFIX}/include/mes
 
 cd ${MES_PREFIX}
 
+# Remove pregenerated files
+rm mes/module/mes/psyntax.pp mes/module/mes/psyntax.pp.header
+
 # These files are symlinked in the repo
 cp mes/module/srfi/srfi-9-struct.mes mes/module/srfi/srfi-9.mes
 cp mes/module/srfi/srfi-9/gnu-struct.mes mes/module/srfi/srfi-9/gnu.mes