diff --git a/src/corelib/time/qtimezoneprivate_data_p.h b/src/corelib/time/qtimezoneprivate_data_p.h
index 255a461064..c8eda2d02d 100644
--- a/src/corelib/time/qtimezoneprivate_data_p.h
+++ b/src/corelib/time/qtimezoneprivate_data_p.h
@@ -44,8 +44,8 @@ struct QZoneData
     quint16 windowsIdKey;      // Windows ID Key
     quint16 territory;         // Territory of IANA ID's, AnyTerritory means No Territory
     quint16 ianaIdIndex;       // All IANA ID's for the Windows ID and Country, space separated
-    inline QLatin1StringView id() const; // Space-joined list of IANA IDs
-    inline auto ids() const { return id().tokenize(u' '); }
+    constexpr QLatin1StringView id() const; // Space-joined list of IANA IDs
+    constexpr auto ids() const { return id().tokenize(u' '); }
 };
 
 struct QWindowsData
@@ -54,15 +54,15 @@ struct QWindowsData
     quint16 windowsIdIndex;    // Windows ID Literal
     quint16 ianaIdIndex;       // IANA IDs for the Windows ID
     qint32 offsetFromUtc;      // Standard Time Offset from UTC, used for quick look-ups
-    inline QByteArrayView windowsId() const;
-    inline QByteArrayView ianaId() const; // Space-joined list of IANA IDs
+    constexpr QByteArrayView windowsId() const;
+    constexpr QByteArrayView ianaId() const; // Space-joined list of IANA IDs
 };
 
 struct QUtcData
 {
     quint16 ianaIdIndex;       // IANA IDs
     qint32 offsetFromUtc;      // Offset form UTC is seconds
-    inline QByteArrayView id() const; // Space-joined list of IANA IDs
+    constexpr QByteArrayView id() const; // Space-joined list of IANA IDs
 };
 
 /*
@@ -1375,11 +1375,11 @@ static constexpr char ianaIdData[] = {
 };
 // GENERATED PART ENDS HERE
 
-inline QByteArrayView QWindowsData::windowsId() const { return windowsIdData + windowsIdIndex; }
+constexpr QByteArrayView QWindowsData::windowsId() const { return windowsIdData + windowsIdIndex; }
 // Each of the following returns a space-joined sequence of IANA IDs:
-inline QByteArrayView QWindowsData::ianaId() const { return ianaIdData + ianaIdIndex; }
-inline QByteArrayView QUtcData::id() const { return ianaIdData + ianaIdIndex; }
-inline QLatin1StringView QZoneData::id() const
+constexpr QByteArrayView QWindowsData::ianaId() const { return ianaIdData + ianaIdIndex; }
+constexpr QByteArrayView QUtcData::id() const { return ianaIdData + ianaIdIndex; }
+constexpr QLatin1StringView QZoneData::id() const
 { return QLatin1StringView(ianaIdData + ianaIdIndex); }
 
 QT_END_NAMESPACE