diff --git a/engines/afalg/e_afalg.c b/engines/afalg/e_afalg.c
index 90d76020683d852c3db8a36d182532065d340d37..3ccf9d517c3134bd6985966c772a8ee23ba08ac3 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