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-rw-r--r--engines/e_cswift.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/engines/e_cswift.c b/engines/e_cswift.c
index b73126b037..0f9c1b264c 100644
--- a/engines/e_cswift.c
+++ b/engines/e_cswift.c
@@ -66,6 +66,7 @@
#include <openssl/dsa.h>
#include <openssl/dh.h>
#include <openssl/rand.h>
+#include <openssl/bn.h>
#ifndef OPENSSL_NO_HW
#ifndef OPENSSL_NO_HW_CSWIFT