diff --git a/src/motion/pint_pile.F b/src/motion/pint_pile.F
index bf58419353..405dbbdbd0 100644
--- a/src/motion/pint_pile.F
+++ b/src/motion/pint_pile.F
@@ -89,7 +89,7 @@ CONTAINS
          pile_therm%g_fric(1) = 1.0_dp/pile_therm%tau
       END IF
       DO i = 2, p
-         pile_therm%g_fric(i) = 2.0_dp*pile_therm%lamb*normalmode_env%lambda(i)
+         pile_therm%g_fric(i) = 2.0_dp*pile_therm%lamb*SQRT(normalmode_env%lambda(i))
       END DO
       DO i = 1, p
          ex = -dti2*pile_therm%g_fric(i)
diff --git a/tests/Pimd/TEST_FILES b/tests/Pimd/TEST_FILES
index b608c33cdd..b5276f6e8b 100644
--- a/tests/Pimd/TEST_FILES
+++ b/tests/Pimd/TEST_FILES
@@ -16,11 +16,11 @@ water-in-helium-lastforce.inp                          9      7e-14        1.071
 water-micro-helium.inp                                 9      1e-13        1.0713355696395585E-003
 w512_pint_nose.inp                                     9      8e-14             9.5780711530210407
 w512_pint_gle.inp                                      9      3e-13            -3.5646497002020765
-w512_pint_pile.inp                                     9      3e-12            0.64599197840093936
+w512_pint_pile.inp                                     9      3e-12            0.86626194213382846
 w512_pint_piglet.inp                                   9      1e-11           74.229316490453456
 centroid_velocity_init.inp                             9    1.0E-14            0.32999751991202331
 he32_density.inp                                      40      2e-14       -6.8167031351590079E-005
 he32_only_worm.inp                                    40      1e-11        1.9115591620126446
 he32_only_worm_restart.inp                            40      1e-11        1.7411512073586795
-water-in-helium-worm.inp                               9      1e-11        1.1453251192918812
+water-in-helium-worm.inp                               9      1e-11        1.1453624372292848
 #EOF