diff --git a/gnu/packages/c.scm b/gnu/packages/c.scm
index 405b1dcba1e..fff7b166f6e 100644
--- a/gnu/packages/c.scm
+++ b/gnu/packages/c.scm
@@ -900,7 +900,7 @@ Service (S3) protocol for object storage.")
 (define-public aws-c-mqtt
   (package
     (name "aws-c-mqtt")
-    ; Update only when updating aws-crt-cpp.
+    ;; Update only when updating aws-crt-cpp.
     (version "0.7.10")
     (source (origin
               (method git-fetch)