diff --git a/man/coap_lwip.txt.in b/man/coap_lwip.txt.in
index f08a8231..557a1939 100644
--- a/man/coap_lwip.txt.in
+++ b/man/coap_lwip.txt.in
@@ -1,5 +1,5 @@
 // -*- mode:doc; -*-
-// vim: set syntax=asciidoc,tw=0:
+// vim: set syntax=asciidoc tw=0
 
 coap_lwip(3)
 ============
diff --git a/man/coap_uri.txt.in b/man/coap_uri.txt.in
index bf5e72a6..7a257fef 100644
--- a/man/coap_uri.txt.in
+++ b/man/coap_uri.txt.in
@@ -1,5 +1,5 @@
 // -*- mode:doc; -*-
-// vim: set syntax=asciidoc,tw=0:
+// vim: set syntax=asciidoc tw=0
 
 coap_uri(3)
 ============