diff --git a/serpent-encrypt.c b/serpent-encrypt.c
index 90878bde6d9dcdf6a94ffe370667c7d7f88d8d7c..21651e84f5a7cc1130ad1c9abc714c8be03bfe95 100644
--- a/serpent-encrypt.c
+++ b/serpent-encrypt.c
@@ -357,7 +357,7 @@
 */
 /* It appears impossible to do this with only 8 registers. We
    recompute t02, and t04 (if we have spare registers, hopefully the
-   compiler can recognize it them as common subexpressions). */
+   compiler can recognize them as common subexpressions). */
 #define SBOX7(x0, x1, x2, x3, y0, y1, y2, y3)	\
   do {							\
     y0  = x0 & x2;					\