diff --git a/src/corelib/tools/qcryptographichash.cpp b/src/corelib/tools/qcryptographichash.cpp
index 4a8a8c1c20c..8453a04f105 100644
--- a/src/corelib/tools/qcryptographichash.cpp
+++ b/src/corelib/tools/qcryptographichash.cpp
@@ -950,7 +950,7 @@ bool QCryptographicHashPrivate::supportsAlgorithm(QCryptographicHash::Algorithm
 #endif
 }
 
-static int qt_hash_block_size(QCryptographicHash::Algorithm method)
+static constexpr int qt_hash_block_size(QCryptographicHash::Algorithm method)
 {
     switch (method) {
     case QCryptographicHash::Sha1: