diff --git a/src/libs/qmuparser/qmudef.h b/src/libs/qmuparser/qmudef.h
index cbe2ba56c..977f00aa9 100644
--- a/src/libs/qmuparser/qmudef.h
+++ b/src/libs/qmuparser/qmudef.h
@@ -135,6 +135,6 @@ static inline bool QmuFuzzyComparePossibleNulls(double p1, double p2)
 QMUPARSERSHARED_EXPORT int ReadVal(const QString &formula, qreal &val, const QLocale &locale, const QChar &decimal,
                                    const QChar &thousand);
 
-int FindFirstNotOf(const QString &string, const QString &chars, int pos = 0);
+QMUPARSERSHARED_EXPORT int FindFirstNotOf(const QString &string, const QString &chars, int pos = 0);
 
 #endif // QMUDEF_H