diff --git a/src/core/tools/qstring.cpp b/src/core/tools/qstring.cpp
index 6d2729049..45865f021 100644
--- a/src/core/tools/qstring.cpp
+++ b/src/core/tools/qstring.cpp
@@ -5657,7 +5657,7 @@ static ArgEscapeData findArgEscapes(const QString &s)
 }
 
 static QString replaceArgEscapes(const QString &s, const ArgEscapeData &d, int field_width,
-                                 const QString &arg, const QString &larg, const QChar &fillChar = QLatin1Char(' '))
+                                 const QString &arg, const QString &larg, const QChar &fillChar)
 {
     const QChar *uc_begin = s.unicode();
     const QChar *uc_end = uc_begin + s.length();