diff --git a/src/utils/lib/CryptoPP.h b/src/utils/lib/CryptoPP.h
index 6c01a929..7a2924cb 100644
--- a/src/utils/lib/CryptoPP.h
+++ b/src/utils/lib/CryptoPP.h
@@ -86,7 +86,6 @@
 #define CRYPTOPP_H
 
 #include <inttypes.h>
-#include <caml/config.h>
 #include <stdio.h>
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -101,9 +100,6 @@
 #	define IS_LITTLE_ENDIAN
 #endif
 
-// override #define in caml/compatibility.h
-#undef flush 
-
 // define this if you want to disable all OS-dependent features,
 // such as sockets and OS-provided random number generators
 // #define NO_OS_DEPENDENCE