diff --git a/tests/QS/regtest-debug-5/TEST_FILES b/tests/QS/regtest-debug-5/TEST_FILES
index eadb7e4b52..db0fdf0cb9 100644
--- a/tests/QS/regtest-debug-5/TEST_FILES
+++ b/tests/QS/regtest-debug-5/TEST_FILES
@@ -15,7 +15,7 @@ h2o_dip16b.inp                                         86      1e-08
 h2o_dip17.inp                                          86      1e-08             0.105779050446E+00
 h2o_dip18.inp                                          86      1e-08             0.164232838981E+00  
 h2o_dip19.inp                                          86      1e-08             0.132011222619E+00 
-h2o_dip20.inp                                          86      1e-08             0.260620397228E+00
+h2o_dip20.inp                                          86      1e-05             0.260620397228E+00
 h2o_dip21.inp                                          86      1e-08             0.176823912039E+00
 h2o_dip22.inp                                          86      1e-08             0.135209164224E+00
 h2o_dip23.inp                                          86      1e-08             0.292668779126E+00