diff --git a/test/t-doEstimatorNormalMulti.cpp b/test/t-doEstimatorNormalMulti.cpp
index 661fe474..c6fdeabc 100644
--- a/test/t-doEstimatorNormalMulti.cpp
+++ b/test/t-doEstimatorNormalMulti.cpp
@@ -1,4 +1,5 @@
 #include <sstream>
+#include <iomanip>
 
 #include <eo>
 #include <mo>
@@ -31,12 +32,14 @@ int main(int ac, char** av)
 
     AtomType mean_value = parser.createParam((AtomType)0, "mean", "Mean value", 'm', section).value(); // m
 
-    AtomType covar1_value = parser.createParam((AtomType)1, "covar1", "Covar value 1", '1', section).value();
+    AtomType covar1_value = parser.createParam((AtomType)1.0, "covar1", "Covar value 1", '1', section).value();
     AtomType covar2_value = parser.createParam((AtomType)0.5, "covar2", "Covar value 2", '2', section).value();
-    AtomType covar3_value = parser.createParam((AtomType)1, "covar3", "Covar value 3", '3', section).value();
+    AtomType covar3_value = parser.createParam((AtomType)1.0, "covar3", "Covar value 3", '3', section).value();
 
     std::ostringstream ss;
-    ss << p_size << "_" << mean_value << "_" << covar1_value << "_" << covar2_value << "_" << covar3_value << "_gen";
+    ss << p_size << "_" << fixed << setprecision(1)
+       << mean_value << "_" << covar1_value << "_" << covar2_value << "_"
+       << covar3_value << "_gen";
     std::string gen_filename = ss.str();
 
     if (parser.userNeedsHelp())
diff --git a/test/test_cov_parameters.py b/test/test_cov_parameters.py
index c73c9fbb..f9199a9e 100755
--- a/test/test_cov_parameters.py
+++ b/test/test_cov_parameters.py
@@ -2,7 +2,7 @@
 
 PSIZE = 10000
 MEAN = 0
-CMD = "./test/t-doEstimatorNormalMulti -P=%s -m=%.1f -1=%.1f -2=%.1f -3=%.1f && ./gplot.py -r TestResPop -p -w 5 -u -g %s -G results_for_test_cov_parameters"
+CMD = "./test/t-doEstimatorNormalMulti -P=%s -m=%.1f -1=%.1f -2=%.1f -3=%.1f && ./gplot.py -r TestResPop -p -w 5 -u -g %s -G results_for_test_cov_parameters -f %s_gen1"
 
 from os import system
 from numpy import arange
@@ -12,6 +12,7 @@ if __name__ == '__main__':
     for p1 in list(arange(0.1, 1.1, 0.1)):
         for p2 in list(arange(-1., 0., 0.1)) + list(arange(0., 1.1, 0.1)):
             for p3 in list(arange(0.1, 1.1, 0.1)):
-                cmd = CMD % ( PSIZE, MEAN, p1, p2, p3, '%d_%.1f_%.1f_%.1f_%.1f' % (PSIZE, MEAN, p1, p2, p3) )
+                gen = '%d_%.1f_%.1f_%.1f_%.1f' % (PSIZE, MEAN, p1, p2, p3)
+                cmd = CMD % ( PSIZE, MEAN, p1, p2, p3, gen, gen )
                 print cmd
                 system( cmd )