diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h
index 577c959b6..2097a6dd9 100644
--- a/include/mbedtls/ssl_internal.h
+++ b/include/mbedtls/ssl_internal.h
@@ -275,26 +275,26 @@
 #endif
 
 #if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
-static inline uint32_t mbedtls_ssl_get_output_buflen( const mbedtls_ssl_context *ctx )
+static inline size_t mbedtls_ssl_get_output_buflen( const mbedtls_ssl_context *ctx )
 {
 #if defined (MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    return (uint32_t) mbedtls_ssl_get_output_max_frag_len( ctx )
+    return mbedtls_ssl_get_output_max_frag_len( ctx )
                + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD
                + MBEDTLS_SSL_CID_OUT_LEN_MAX;
 #else
-    return (uint32_t) mbedtls_ssl_get_output_max_frag_len( ctx )
+    return mbedtls_ssl_get_output_max_frag_len( ctx )
                + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD;
 #endif
 }
 
-static inline uint32_t mbedtls_ssl_get_input_buflen( const mbedtls_ssl_context *ctx )
+static inline size_t mbedtls_ssl_get_input_buflen( const mbedtls_ssl_context *ctx )
 {
 #if defined (MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    return (uint32_t) mbedtls_ssl_get_input_max_frag_len( ctx )
+    return mbedtls_ssl_get_input_max_frag_len( ctx )
                + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD
                + MBEDTLS_SSL_CID_IN_LEN_MAX;
 #else
-    return (uint32_t) mbedtls_ssl_get_input_max_frag_len( ctx )
+    return mbedtls_ssl_get_input_max_frag_len( ctx )
                + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD;
 #endif
 }
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 4a57e769a..336cbea37 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -262,8 +262,8 @@ static int resize_buffer( unsigned char **buffer, size_t len_new, size_t *len_ol
 }
 
 static void handle_buffer_resizing( mbedtls_ssl_context *ssl, int downsizing,
-                                    uint32_t in_buf_new_len,
-                                    uint32_t out_buf_new_len )
+                                    size_t in_buf_new_len,
+                                    size_t out_buf_new_len )
 {
     int modified = 0;
     size_t written_in = 0, iv_offset_in = 0, len_offset_in = 0;