diff --git a/crypto/idea/idea.h b/crypto/idea/idea.h
index 67132414ee7baaffd55f87ae38306b92d9b61323..5782e54b0fdcade12d38d4993a03708cc246951e 100644
--- a/crypto/idea/idea.h
+++ b/crypto/idea/idea.h
@@ -59,6 +59,8 @@
 #ifndef HEADER_IDEA_H
 #define HEADER_IDEA_H
 
+#include <openssl/opensslconf.h> /* IDEA_INT, OPENSSL_NO_IDEA */
+
 #ifdef OPENSSL_NO_IDEA
 #error IDEA is disabled.
 #endif
@@ -66,7 +68,6 @@
 #define IDEA_ENCRYPT	1
 #define IDEA_DECRYPT	0
 
-#include <openssl/opensslconf.h> /* IDEA_INT */
 #define IDEA_BLOCK	8
 #define IDEA_KEY_LENGTH	16