diff --git a/src/libs/utils/mimetypes/mimemagicrule.cpp b/src/libs/utils/mimetypes/mimemagicrule.cpp
index dc94cec4093..397bf23c903 100644
--- a/src/libs/utils/mimetypes/mimemagicrule.cpp
+++ b/src/libs/utils/mimetypes/mimemagicrule.cpp
@@ -185,7 +185,7 @@ static bool matchNumber(const MimeMagicRulePrivate *d, const QByteArray &data)
     return false;
 }
 
-static inline QByteArray makePattern(const QByteArray &value)
+QByteArray MimeMagicRule::makePattern(const QByteArray &value)
 {
     QByteArray pattern(value.size(), Qt::Uninitialized);
     char *data = pattern.data();
diff --git a/src/libs/utils/mimetypes/mimemagicrule_p.h b/src/libs/utils/mimetypes/mimemagicrule_p.h
index b4a96765fa2..25a3b2b52b5 100644
--- a/src/libs/utils/mimetypes/mimemagicrule_p.h
+++ b/src/libs/utils/mimetypes/mimemagicrule_p.h
@@ -89,6 +89,8 @@ public:
     static QByteArray typeName(Type type);
 
     static bool matchSubstring(const char *dataPtr, int dataSize, int rangeStart, int rangeLength, int valueLength, const char *valueData, const char *mask);
+    // Qt Creator additions
+    static QByteArray makePattern(const QByteArray &value); // necessary to be able to verify magic because otherwise MimMagicRule constructor asserts...
 
 private:
     const QScopedPointer<MimeMagicRulePrivate> d;