diff --git a/crypto/asn1/tasn_dec.c b/crypto/asn1/tasn_dec.c
index 22e5b4ab52..6b0c248173 100644
--- a/crypto/asn1/tasn_dec.c
+++ b/crypto/asn1/tasn_dec.c
@@ -58,6 +58,7 @@
 
 
 #include <stddef.h>
+#include <string.h>
 #include <openssl/asn1.h>
 #include <openssl/asn1t.h>
 #include <openssl/objects.h>