diff --git a/ChangeLog b/ChangeLog
index 3ddf1f961..8d8615bb6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -38,6 +38,7 @@
      [sshconnect.c]
      swapped args to kill(2)
  - (djm) [openbsd-compat/glob.c] restore ARG_MAX compat code.
+ - (djm) [cipher-acss.c] Add missing header.
 
 20100924
  - (djm) OpenBSD CVS Sync
diff --git a/cipher-acss.c b/cipher-acss.c
index df74b0cb6..e755f92b9 100644
--- a/cipher-acss.c
+++ b/cipher-acss.c
@@ -23,6 +23,7 @@
 #if !defined(EVP_CTRL_SET_ACSS_MODE) && (OPENSSL_VERSION_NUMBER >= 0x00907000L)
 
 #include "acss.h"
+#include "openbsd-compat/openssl-compat.h"
 
 #define data(ctx) ((EVP_ACSS_KEY *)(ctx)->cipher_data)