1f5cfb
diff --git a/print-esp.c b/print-esp.c
3b30e2
index 6fabff1..cdeca9d 100644
1f5cfb
--- a/print-esp.c
1f5cfb
+++ b/print-esp.c
3b30e2
@@ -259,7 +259,7 @@ int esp_print_decrypt_buffer_by_ikev2(netdissect_options *ndo,
1f5cfb
 		EVP_CIPHER_CTX_free(ctx);
3b30e2
 		(*ndo->ndo_error)(ndo, "can't allocate memory for decryption buffer");
1f5cfb
 	}
3b30e2
-	EVP_Cipher(ctx, output_buffer, input_buffer, len);
1f5cfb
+	EVP_Cipher(ctx, output_buffer, input_buffer, buffer_size);
1f5cfb
 	EVP_CIPHER_CTX_free(ctx);
1f5cfb
 
1f5cfb
 	/*