diff --git a/library/constant_time_internal.h b/library/constant_time_internal.h
index 6168108..69cd092 100644
--- a/library/constant_time_internal.h
+++ b/library/constant_time_internal.h
@@ -171,7 +171,7 @@
 
 /** Conditional memcpy without branches.
  *
- * This is equivalent to `if ( c1 == c2 ) memcpy(dst, src, len)`, but is likely
+ * This is equivalent to `if ( c1 == c2 ) memcpy(dest, src, len)`, but is likely
  * to be compiled to code using bitwise operation rather than a branch.
  *
  * \param dest      The pointer to conditionally copy to.