diff --git a/scripts/config.pl b/scripts/config.pl
index d9aef53..1fc156c 100755
--- a/scripts/config.pl
+++ b/scripts/config.pl
@@ -64,7 +64,7 @@
 #   MBEDTLS_PLATFORM_FAULT_CALLBACKS
 #   MBEDTLS_DELAYED_SERVER_CERT_VERIFICATION
 #   MBEDTLS_SSL_FREE_SERVER_CERTIFICATE
-#   MBEDTLS_IMMEDIATE_TRANSMISSION
+#   MBEDTLS_SSL_IMMEDIATE_TRANSMISSION
 #   MBEDTLS_EARLY_KEY_COMPUTATION
 #   and any symbol beginning _ALT
 #
@@ -156,7 +156,7 @@
 MBEDTLS_PLATFORM_FAULT_CALLBACKS
 MBEDTLS_DELAYED_SERVER_CERT_VERIFICATION
 MBEDTLS_SSL_FREE_SERVER_CERTIFICATE
-MBEDTLS_IMMEDIATE_TRANSMISSION
+MBEDTLS_SSL_IMMEDIATE_TRANSMISSION
 MBEDTLS_EARLY_KEY_COMPUTATION
 _ALT\s*$
 );