diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index eb22b21..747025a 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -970,7 +970,7 @@
     if( md_info == NULL )
     {
         MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %u not found",
-                            ciphersuite_info->mac ) );
+                            (unsigned) ciphersuite_info->mac ) );
         return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
     }
 
@@ -2215,8 +2215,8 @@
         n = crt->raw.len;
         if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i )
         {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %zu > %d",
-                           i + 3 + n, MBEDTLS_SSL_OUT_CONTENT_LEN ) );
+            MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %zu > %zu",
+                           i + 3 + n, (size_t) MBEDTLS_SSL_OUT_CONTENT_LEN ) );
             return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
         }
 
@@ -2707,7 +2707,7 @@
 #if defined(MBEDTLS_DEBUG_C)
     if( ssl->session_negotiate->verify_result != 0 )
     {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x",
+        MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %08x",
                                     (unsigned int) ssl->session_negotiate->verify_result ) );
     }
     else