diff --git a/configs/config-ccm-psk-tls1_2.h b/configs/config-ccm-psk-tls1_2.h
index c58d150..a3662d8 100644
--- a/configs/config-ccm-psk-tls1_2.h
+++ b/configs/config-ccm-psk-tls1_2.h
@@ -79,7 +79,8 @@
  * both ends of the connection!  (See comments in "mbedtls/ssl.h".)
  * The optimal size here depends on the typical size of records.
  */
-#define MBEDTLS_SSL_MAX_CONTENT_LEN             1024
+#define MBEDTLS_SSL_IN_CONTENT_LEN             1024
+#define MBEDTLS_SSL_OUT_CONTENT_LEN             1024
 
 #include "mbedtls/check_config.h"
 
diff --git a/configs/config-suite-b.h b/configs/config-suite-b.h
index 7cb566c..f1c809e 100644
--- a/configs/config-suite-b.h
+++ b/configs/config-suite-b.h
@@ -107,7 +107,8 @@
  * The minimum size here depends on the certificate chain used as well as the
  * typical size of records.
  */
-#define MBEDTLS_SSL_MAX_CONTENT_LEN             1024
+#define MBEDTLS_SSL_IN_CONTENT_LEN             1024
+#define MBEDTLS_SSL_OUT_CONTENT_LEN             1024
 
 #include "mbedtls/check_config.h"