diff --git a/matlab/prior_sampler.m b/matlab/prior_sampler.m
index 9e525709b288607775566dcbee96665bea5ae87e..267563d8e87c7fe248535f96214ce870f58282b2 100644
--- a/matlab/prior_sampler.m
+++ b/matlab/prior_sampler.m
@@ -57,6 +57,7 @@ NumberOfElementsPerFile = ceil(options_.MaxNumberOfBytes/NumberOfParameters/Numb
 
 if NumberOfSimulations <= NumberOfElementsPerFile
     TableOfInformations = [ 1 ,  NumberOfSimulations , 1] ;
+    NumberOfFiles = 1;
 else
     NumberOfFiles = ceil(NumberOfSimulations/NumberOfElementsPerFile) ;
     NumberOfElementsInTheLastFile = NumberOfSimulations - NumberOfElementsPerFile*(NumberOfFiles-1) ;