diff --git a/commands/flex-2.5.4/build b/commands/flex-2.5.4/build
index 417382d7c..cec4ae822 100755
--- a/commands/flex-2.5.4/build
+++ b/commands/flex-2.5.4/build
@@ -2,6 +2,7 @@
 
 CCACHE=config.cache
 rm -f $CCACHE
+make distclean
 RANLIB=true AR=ar CONFIG_SHELL=/bin/bigsh CC=cc /bin/bigsh ./configure --prefix=/usr
 make clean all install