diff --git a/lib/vtls/mbedtls.c b/lib/vtls/mbedtls.c
index 1e9891971da08da9a287bdd0838737b7fea7a38a..f61d7a96d65a01b5e313b8371f97093b61c24c91 100644
--- a/lib/vtls/mbedtls.c
+++ b/lib/vtls/mbedtls.c
@@ -22,7 +22,7 @@
  ***************************************************************************/
 
 /*
- * Source file for all mbedTSL-specific code for the TLS/SSL layer. No code
+ * Source file for all mbedTLS-specific code for the TLS/SSL layer. No code
  * but vtls.c should ever call or use these functions.
  *
  */