diff --git a/regtest/isdb/rt-emmi-metad-mpi/plumed.dat b/regtest/isdb/rt-emmi-metad-mpi/plumed.dat
index aed8650e08..3f27ae849a 100644
--- a/regtest/isdb/rt-emmi-metad-mpi/plumed.dat
+++ b/regtest/isdb/rt-emmi-metad-mpi/plumed.dat
@@ -17,7 +17,7 @@ EMMI ...
     LABEL=gmm NOPBC TEMP=310 NL_STRIDE=10 NL_CUTOFF=0.1
     ATOMS=protein-h GMM_FILE=map.dat
     AVERAGING=5 WRITE_STRIDE=10
-    SIGMA0=0.5 SIGMA_MIN=0.2 RESOLUTION=1.0 NOISETYPE=GAUSS
+    SIGMA0=0.5 SIGMA_MIN=0.2 DSIGMA=0.0 RESOLUTION=1.0 NOISETYPE=GAUSS
 ...
 
 DUMPDERIVATIVES ARG=gmm.scoreb STRIDE=1 FMT=%8.1f FILE=deriva