diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 2391e098c..228fcdcb0 100644
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -93,10 +93,6 @@ $(eval $(call RequireCommand,gawk, \
 	Please install GNU awk. \
 ))
 
-$(eval $(call RequireCommand,flex, \
-	Please install flex. \
-))
-
 $(eval $(call RequireCommand,unzip, \
 	Please install unzip. \
 ))