diff --git a/tests/scripts/test-ref-configs.pl b/tests/scripts/test-ref-configs.pl
index dc398c1..16fd4ec 100755
--- a/tests/scripts/test-ref-configs.pl
+++ b/tests/scripts/test-ref-configs.pl
@@ -34,6 +34,8 @@
     },
     'config-ccm-psk-dtls1_2.h' => {
         'compat' => '-m dtls12 -f \'^TLS-PSK-WITH-AES-...-CCM-8\'',
+        'opt' => ' ',
+        'opt_needs_debug' => 1,
         'test_again_with_use_psa' => 1
     },
     'config-no-entropy.h' => {
@@ -41,6 +43,8 @@
     'config-suite-b.h' => {
         'compat' => "-m tls12 -f 'ECDHE-ECDSA.*AES.*GCM' -p mbedTLS",
         'test_again_with_use_psa' => 1,
+        'opt' => ' ',
+        'opt_needs_debug' => 1,
     },
     'config-symmetric-only.h' => {
         'test_again_with_use_psa' => 0, # Uses PSA by default, no need to test it twice
@@ -132,6 +136,15 @@
     my $opt = $data->{'opt'};
     if( $opt )
     {
+        if( $data->{'opt_needs_debug'} )
+        {
+            print "\nrebuilding with debug traces for ssl-opt\n";
+            system( "make clean" );
+            system( "scripts/config.py set MBEDTLS_DEBUG_C" );
+            system( "scripts/config.py set MBEDTLS_ERROR_C" );
+            system( "CFLAGS='-Os -Werror -Wall -Wextra' make" ) and abort "Failed to build: $conf +debug\n";
+        }
+
         print "\nrunning ssl-opt.sh $opt\n";
         system( "tests/ssl-opt.sh $opt" )
             and abort "Failed ssl-opt.sh: $conf\n";