diff --git a/engines/afalg/e_afalg.c b/engines/afalg/e_afalg.c
index 90d760206..3ccf9d517 100644
--- a/engines/afalg/e_afalg.c
+++ b/engines/afalg/e_afalg.c
@@ -60,6 +60,7 @@
 
 #include <openssl/engine.h>
 #include <openssl/async.h>
+#include <openssl/err.h>
 
 #include <linux/version.h>
 #define K_MAJ   4