diff --git a/src/pao_main.F b/src/pao_main.F
index 0432897c3d..19a00c9214 100644
--- a/src/pao_main.F
+++ b/src/pao_main.F
@@ -286,7 +286,7 @@ CONTAINS
          ! perform line-search step
          CALL linesearch_step(pao%linesearch, energy=energy, slope=pao%norm_G**2)
 
-         IF (pao%linesearch%step_size < 1e-10_dp) CPABORT("PAO gradient is wrong.")
+         IF (pao%linesearch%step_size < 1e-9_dp) CPABORT("PAO gradient is wrong.")
 
          CALL dbcsr_copy(pao%matrix_X, pao%matrix_X_orig) !restore X
          CALL dbcsr_add(pao%matrix_X, pao%matrix_D, 1.0_dp, pao%linesearch%step_size)
diff --git a/tests/Fist/regtest-7-2/TEST_FILES b/tests/Fist/regtest-7-2/TEST_FILES
index 3759c1ee3b..b9fbd62580 100644
--- a/tests/Fist/regtest-7-2/TEST_FILES
+++ b/tests/Fist/regtest-7-2/TEST_FILES
@@ -68,5 +68,5 @@ UO2-4x4x4-cs-fixd-restart.inp                         44    1.0E-14
 UO2-4x4x4-cs-fixd-nvt.inp                             54    1.0E-14                       0.041076
 UO2-4x4x4-cs-fixd-npt.inp                             54    1.0E-14                       0.045987
 # Test UO2 force fields with generic input
-UO2-Morelon-5x5x5-cell_opt.inp                        11    1.0E-13          -1210.562919201563318
+UO2-Morelon-5x5x5-cell_opt.inp                        11    5.0E-13          -1210.562919201563318
 #EOF