diff --git a/library/error.c b/library/error.c
index 9445e51..85bc6ac 100644
--- a/library/error.c
+++ b/library/error.c
@@ -49,6 +49,10 @@
 #include "mbedtls/arc4.h"
 #endif
 
+#if defined(MBEDTLS_ASN1_PARSE_C)
+#include "mbedtls/asn1.h"
+#endif
+
 #if defined(MBEDTLS_BASE64_C)
 #include "mbedtls/base64.h"
 #endif