Index: /trunk/FACT++/src/rootifysql.cc
===================================================================
--- /trunk/FACT++/src/rootifysql.cc	(revision 19300)
+++ /trunk/FACT++/src/rootifysql.cc	(revision 19301)
@@ -875,5 +875,5 @@
         ttree.emplace_back(new TTree(tree.c_str(), query.c_str()));
     else
-        for (int i=0; i<num_split; i++)
+        for (size_t i=0; i<num_split; i++)
             ttree.emplace_back(new TTree((tree+"["+to_string(i)+"]").c_str(), query.c_str()));
 
@@ -955,5 +955,5 @@
             names.emplace_back(write);
         else
-            for (int i=0; i<num_split; i++)
+            for (size_t i=0; i<num_split; i++)
                 names.emplace_back(write+"-"+to_string(i));
 
@@ -1098,5 +1098,5 @@
             cout << skip << " rows skipped due to NULL field." << endl;
 
-        for (int i=0; i<ttree.size(); i++)
+        for (size_t i=0; i<ttree.size(); i++)
             cout << ttree[i]->GetEntries() << " rows filled into tree #" << i << "." << endl;
     }