1 files changed, 2 insertions, 3 deletions
diff --git a/tests/auto/cplusplus/c99/tst_c99.cpp b/tests/auto/cplusplus/c99/tst_c99.cpp
index df33671907c..edcb5f955f0 100644
--- a/tests/auto/cplusplus/c99/tst_c99.cpp
+++ b/tests/auto/cplusplus/c99/tst_c99.cpp
@@ -83,11 +83,10 @@ class tst_c99: public QObject
 
             static const char *const pretty[] = {"warning", "error", "fatal"};
 
-            QString str;
-            str.sprintf("%s:%d:%d: %s: ", fileName->chars(), line, column, pretty[level]);
+            QString str = QString::asprintf("%s:%d:%d: %s: ", fileName->chars(), line, column, pretty[level]);
             errors->append(str.toUtf8());
 
-            str.vsprintf(format, ap);
+            str += QString::vasprintf(format, ap);
             errors->append(str.toUtf8());
 
             errors->append('\n');