diff --git a/krusader/Dialogs/packguibase.cpp b/krusader/Dialogs/packguibase.cpp
--- a/krusader/Dialogs/packguibase.cpp
+++ b/krusader/Dialogs/packguibase.cpp
@@ -435,7 +435,7 @@
         }
 
         QString sbuffer;
-        sbuffer.sprintf("%llu", size);
+        sbuffer.asprintf("%llu", size);
 
         inMap[ "VolumeSize" ] = sbuffer;
     }
diff --git a/krusader/DiskUsage/filelightParts/fileTree.h b/krusader/DiskUsage/filelightParts/fileTree.h
--- a/krusader/DiskUsage/filelightParts/fileTree.h
+++ b/krusader/DiskUsage/filelightParts/fileTree.h
@@ -294,7 +294,7 @@
         if (m_percent < 0)
             return "INV";
         QString buf;
-        buf.sprintf("%d.%02d%%", m_percent / 100, m_percent % 100);
+        buf.asprintf("%d.%02d%%", m_percent / 100, m_percent % 100);
         return buf;
     }
     inline void             setPercent(int p)          {