diff --git a/doc/articles/wiki/Makefile b/doc/articles/wiki/Makefile
index e40b1311ed..2f801b3c34 100644
--- a/doc/articles/wiki/Makefile
+++ b/doc/articles/wiki/Makefile
@@ -4,7 +4,7 @@
 
 all: index.html
 
-CLEANFILES:=get.bin final-test.bin a.out
+CLEANFILES=get.bin final-test.bin a.out
 
 clean:
 	rm -f $(CLEANFILES)