diff --git a/library/ssl_debug_helpers.h b/library/ssl_debug_helpers.h
index a8e3140..4889e77 100644
--- a/library/ssl_debug_helpers.h
+++ b/library/ssl_debug_helpers.h
@@ -23,6 +23,7 @@
 
 #if defined(MBEDTLS_SSL_EARLY_DATA) && defined(MBEDTLS_SSL_CLI_C)
 const char *mbedtls_ssl_early_data_status_str(mbedtls_ssl_early_data_status in);
+const char *mbedtls_ssl_early_data_state_str(mbedtls_ssl_early_data_state in);
 #endif
 
 const char *mbedtls_ssl_protocol_version_str(mbedtls_ssl_protocol_version in);