diff --git a/configure.ac b/configure.ac
index 34a405794..3eaae77a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -312,6 +312,7 @@ AC_HEADER_STDC
 
 AC_CHECK_HEADERS([\
 	CommonCrypto/CommonDigest.h		\
+	CommonCrypto/CommonCryptor.h		\
 	arpa/ftp.h				\
 	arpa/telnet.h				\
 	bind/bitypes.h				\