diff --git a/src/gui/text/qcssparser.cpp b/src/gui/text/qcssparser.cpp
index 87818b00107..1a70ca84872 100644
--- a/src/gui/text/qcssparser.cpp
+++ b/src/gui/text/qcssparser.cpp
@@ -360,7 +360,7 @@ static bool operator<(const QCssKnownValue &prop, const QString &name)
 
 static quint64 findKnownValue(const QString &name, const QCssKnownValue *start, int numValues)
 {
-    const QCssKnownValue *end = start + numValues - 1;
+    const QCssKnownValue *end = start + (numValues - 1);
     const QCssKnownValue *prop = std::lower_bound(start, end, name);
     if ((prop == end) || (name < *prop))
         return 0;