diff --git a/src/corelib/tools/qdatetime.cpp b/src/corelib/tools/qdatetime.cpp
index 7d1ed9d2ba5..a16cfef1b2f 100644
--- a/src/corelib/tools/qdatetime.cpp
+++ b/src/corelib/tools/qdatetime.cpp
@@ -122,6 +122,8 @@ struct ParsedDate
     int year, month, day;
 };
 
+// prevent this function from being inlined into all 10 users
+Q_NEVER_INLINE
 static ParsedDate getDateFromJulianDay(qint64 julianDay)
 {
 /*