diff --git a/c_tools/mock/generateMock.cpp b/c_tools/mock/generateMock.cpp
index 27890f4..a7830dd 100644
--- a/c_tools/mock/generateMock.cpp
+++ b/c_tools/mock/generateMock.cpp
@@ -524,7 +524,7 @@ int main(int argc, char **argv)
     cout << "Boxsize = " << header->BoxSize << endl;
     cout << "Omega_M = " << header->Omega_M << endl;
     cout << "Omega_Lambda = " << header->Omega_Lambda << endl;
-    cout << "Subsample fraction: " << (args_info.subsample_given ? 1 : args_info.subsample_arg) << endl;
+    cout << "Subsample fraction: " << (args_info.subsample_given ? args_info.subsample_arg : 1.0) << endl;
   }
   double *expfact;
 
diff --git a/python_tools/void_python_tools/backend/launchers.py b/python_tools/void_python_tools/backend/launchers.py
index 5333b88..45c117a 100755
--- a/python_tools/void_python_tools/backend/launchers.py
+++ b/python_tools/void_python_tools/backend/launchers.py
@@ -133,7 +133,7 @@ def launchGenerate(sample, binPath, workDir=None, inputDataDir=None,
       rangeY_max %g
       rangeZ_min %g
       rangeZ_max %g
-      subsample %s
+      subsample %g
       """ % (dataFileLine, zobovDir+"/zobov_slice_"+sampleName,
              zobovDir+"/zobov_slice_"+sampleName+".par",
              includePecVelString,