diff --git a/include/prereq-build.mk b/include/prereq-build.mk
index 59ea7ef9a7..dadce81ad5 100644
--- a/include/prereq-build.mk
+++ b/include/prereq-build.mk
@@ -183,3 +183,7 @@ endef
 $(eval $(call Require,getopt-extended, \
 	Please install an extended getopt version that supports --long \
 ))
+
+$(eval $(call RequireCommand,bc, \
+	Please install bc. \
+))