1 files changed, 1 insertions, 2 deletions

diff --git a/src/tests/heap.cpp b/src/tests/heap.cpp
index 14da55a..520a57f 100644
--- a/src/tests/heap.cpp
+++ b/src/tests/heap.cpp
@@ -41,8 +41,7 @@ typedef struct num
 void printHeap( Bu::Heap<Bu::String> &h, int j )
 {
 //      return;
-        Bu::String sFName;
-        sFName.format("graph-step-%02d.dot", j );
+        Bu::String sFName = Bu::String("graph-step-%1.dot").arg( j, Bu::Fmt().width(2).fill('0') );
         Bu::File fOut( sFName, Bu::File::WriteNew );
         Bu::Formatter f( fOut );
         f << "Graph step: " << j << ", total size: " << h.getSize() << f.nl;