diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 6d3241b..58acb8e 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -33,7 +33,6 @@ include( CheckIncludeFile )
 CHECK_INCLUDE_FILE( fcntl.h CHK_DLFCN )
 if( CHK_DLFCN )
   set( HAVE_DLFCN_H ON )
-  add_definitions( -DHAVE_DLFCN_H )
 endif()
 
 if( APPLE )