diff --git a/gnu/packages/crypto.scm b/gnu/packages/crypto.scm
index 7716205947..84a3b7876f 100644
--- a/gnu/packages/crypto.scm
+++ b/gnu/packages/crypto.scm
@@ -576,7 +576,7 @@ (define-public perl-math-random-secure
 @item No matter how many numbers you see generated by the random number
 generator, you cannot guess the future numbers, and you cannot guess the seed.
 @item There are so many possible seeds that it would take decades, centuries,
-or millenia for an attacker to try them all.
+or millennia for an attacker to try them all.
 @item The seed comes from a source that generates relatively strong random
 data on your platform, so the seed itself will be as random as possible.
 @end enumerate\n")