diff --git a/include/config.h b/include/config.h
index 212e53e54..07e350a72 100644
--- a/include/config.h
+++ b/include/config.h
@@ -277,7 +277,7 @@
  *      uncommented to define NODUMPENUMS. Doing so will disable the
  *          nethack --dumpenums
  *      command line option.
- *      Note:  the extra memory is also used by when ENHANCED_SYMBOLS is
+ *      Note:  the extra memory is also used when ENHANCED_SYMBOLS is
  *      defined, so defining both ENHANCED_SYMBOLS and NODUMPENUMS will limit
  *      the amount of memory and code reduction offered by the latter.
  */