diff --git a/src/read/load_m_file_data.m b/src/read/load_m_file_data.m
index 1867d3da2739a6feddf9f3eb19df03147cf90075..3a392f2ac7246a802c6428935039b25bd577fe76 100644
--- a/src/read/load_m_file_data.m
+++ b/src/read/load_m_file_data.m
@@ -42,7 +42,7 @@ end
 
 clear file basename;
 
-save tmp__dataSet__;
+save tmp__dataSet__.mat;
 
 [freq, init, data, varlist, tex, ops, tags] = load_mat_file_data('tmp__dataSet__.mat');