diff --git a/ChangeLog b/ChangeLog
index c92c2a05a4e1f24566e2322d782a523e10c72068..ac76f040657a31281693b44fea773ce05c510a50 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2014-03-16  Niels Möller  <nisse@lysator.liu.se>
 
+	* chacha-set-key.c: Include string.h.
+
 	* arcfour-meta.c: Deleted file.
 	* nettle-meta.h (nettle_arcfour128): Deleted declaration.
 	* nettle-meta-ciphers.c (nettle_ciphers): Deleted
diff --git a/chacha-set-key.c b/chacha-set-key.c
index 04f86398905acdf779aafe323bbf21b99c7f1771..45fa7b2b6e48475a0e99627a0fc2d8f149e09b76 100644
--- a/chacha-set-key.c
+++ b/chacha-set-key.c
@@ -23,6 +23,7 @@
 #endif
 
 #include <stdlib.h>
+#include <string.h>
 
 #include "chacha.h"