diff --git a/src/libs/cplusplus/CppDocument.cpp b/src/libs/cplusplus/CppDocument.cpp
index c029c60dcaa..73cc06f26ad 100644
--- a/src/libs/cplusplus/CppDocument.cpp
+++ b/src/libs/cplusplus/CppDocument.cpp
@@ -228,8 +228,7 @@ public:
         if (fileName != doc->fileName())
             return;
 
-        QString message;
-        message.vsprintf(format, ap);
+        const QString message = QString::vasprintf(format, ap);
 
 #ifndef DO_NOT_DUMP_ALL_PARSER_ERRORS
         {
diff --git a/src/tools/cplusplus-ast2png/cplusplus-ast2png.cpp b/src/tools/cplusplus-ast2png/cplusplus-ast2png.cpp
index 59aab237ec1..ad69adae56f 100644
--- a/src/tools/cplusplus-ast2png/cplusplus-ast2png.cpp
+++ b/src/tools/cplusplus-ast2png/cplusplus-ast2png.cpp
@@ -423,12 +423,11 @@ public:
 
         static const char *const pretty[] = {"warning", "error", "fatal"};
 
-        QString str;
-        str.sprintf("%s:%d:%d: When parsing as %s: %s: ", fileName->chars(), line, column,
+        QString str = QString::asprintf("%s:%d:%d: When parsing as %s: %s: ", fileName->chars(), line, column,
                     parseModeToString(m_parseMode).toUtf8().constData(), pretty[level]);
         m_errorString->append(str.toUtf8());
 
-        str.vsprintf(format, ap);
+        str += QString::vasprintf(format, ap);
         m_errorString->append(str.toUtf8());
         m_errorString->append('\n');
     }
diff --git a/tests/auto/cplusplus/ast/tst_ast.cpp b/tests/auto/cplusplus/ast/tst_ast.cpp
index 0cf9c7a5609..e444a4b8e5e 100644
--- a/tests/auto/cplusplus/ast/tst_ast.cpp
+++ b/tests/auto/cplusplus/ast/tst_ast.cpp
@@ -97,7 +97,7 @@ public:
         {
             ++errorCount;
 
-            qDebug() << fileName->chars()<<':'<<line<<':'<<column<<' '<<QString().vsprintf(format, ap);
+            qDebug() << fileName->chars()<<':'<<line<<':'<<column<<' ' << QString::vasprintf(format, ap);
         }
     };
 
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');
diff --git a/tests/auto/cplusplus/cxx11/tst_cxx11.cpp b/tests/auto/cplusplus/cxx11/tst_cxx11.cpp
index 108d93f18f7..abef7cc1e17 100644
--- a/tests/auto/cplusplus/cxx11/tst_cxx11.cpp
+++ b/tests/auto/cplusplus/cxx11/tst_cxx11.cpp
@@ -85,11 +85,10 @@ class tst_cxx11: 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');
diff --git a/tests/auto/cplusplus/semantic/tst_semantic.cpp b/tests/auto/cplusplus/semantic/tst_semantic.cpp
index 3904558efcd..e13795154bf 100644
--- a/tests/auto/cplusplus/semantic/tst_semantic.cpp
+++ b/tests/auto/cplusplus/semantic/tst_semantic.cpp
@@ -120,7 +120,7 @@ public:
             ++errorCount;
 
 #ifndef NO_PARSER_OR_SEMANTIC_ERROR_MESSAGES
-            qDebug() << fileName->chars()<<':'<<line<<':'<<column<<' '<<QString().vsprintf(format, ap);
+            qDebug() << fileName->chars()<<':'<<line<<':'<<column<<' ' << QString::vasprintf(format, ap);
 #else
             Q_UNUSED(fileName);
             Q_UNUSED(line);
diff --git a/tests/auto/cplusplus/translationunit/tst_translationunit.cpp b/tests/auto/cplusplus/translationunit/tst_translationunit.cpp
index 4a2159bf048..2c651676bc7 100644
--- a/tests/auto/cplusplus/translationunit/tst_translationunit.cpp
+++ b/tests/auto/cplusplus/translationunit/tst_translationunit.cpp
@@ -133,7 +133,7 @@ private:
             {
                 ++errorCount;
                 qDebug() << fileName->chars() << ':' << line << ':' << column
-                         << ' ' << QString().vsprintf(format, ap);
+                         << ' ' << QString::vasprintf(format, ap);
             }
         } m_diagnosticClient;
     };