diff --git a/programs/ssl/ssl_mail_client.c b/programs/ssl/ssl_mail_client.c
index 85514ee..32960ad 100644
--- a/programs/ssl/ssl_mail_client.c
+++ b/programs/ssl/ssl_mail_client.c
@@ -18,7 +18,7 @@
  */
 
 /* Enable definition of gethostname() even when compiling with -std=c99. Must
- * be set before config.h, which pulls in glibc's features.h indirectly.
+ * be set before mbedtls_config.h, which pulls in glibc's features.h indirectly.
  * Harmless on other platforms. */
 
 #define _POSIX_C_SOURCE 200112L