diff --git a/src/plugins/coreplugin/fileiconprovider.cpp b/src/plugins/coreplugin/fileiconprovider.cpp
index ee66a5777f5..b216b41248d 100644
--- a/src/plugins/coreplugin/fileiconprovider.cpp
+++ b/src/plugins/coreplugin/fileiconprovider.cpp
@@ -191,35 +191,32 @@ QPixmap overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlay, const
   Registers an icon for a given suffix, overlaying the system file icon.
   See platform note in class documentation about recommended usage.
   */
-void registerIconOverlayForSuffix(const char *path, const char *suffix)
+void registerIconOverlayForSuffix(const QString &path, const QString &suffix)
 {
-    instance()->registerIconOverlayForSuffix(QIcon(QLatin1String(path)), QLatin1String(suffix));
+    instance()->registerIconOverlayForSuffix(QIcon(path), suffix);
 }
 
 /*!
   Registers an icon for all the suffixes of a given mime type, overlaying the system file icon.
   */
-void registerIconOverlayForMimeType(const QIcon &icon, const char *mimeType)
+void registerIconOverlayForMimeType(const QIcon &icon, const QString &mimeType)
 {
     Utils::MimeDatabase mdb;
-    instance()->registerIconOverlayForMimeType(icon,
-                                               mdb.mimeTypeForName(QString::fromLatin1(mimeType)));
+    instance()->registerIconOverlayForMimeType(icon, mdb.mimeTypeForName(mimeType));
 }
 
 /*!
  * \overload
  */
-void registerIconOverlayForMimeType(const char *path, const char *mimeType)
+void registerIconOverlayForMimeType(const QString &path, const QString &mimeType)
 {
     Utils::MimeDatabase mdb;
-    instance()->registerIconOverlayForMimeType(QIcon(QLatin1String(path)),
-                                               mdb.mimeTypeForName(QString::fromLatin1(mimeType)));
+    instance()->registerIconOverlayForMimeType(QIcon(path), mdb.mimeTypeForName(mimeType));
 }
 
-void registerIconOverlayForFilename(const char *path, const char *filename)
+void registerIconOverlayForFilename(const QString &path, const QString &filename)
 {
-    instance()->registerIconOverlayForFilename(QIcon(QString::fromLatin1(path)),
-                                               QString::fromLatin1(filename));
+    instance()->registerIconOverlayForFilename(QIcon(path), filename);
 }
 
 } // namespace FileIconProvider
diff --git a/src/plugins/coreplugin/fileiconprovider.h b/src/plugins/coreplugin/fileiconprovider.h
index c31ceae3352..dc7f57c2996 100644
--- a/src/plugins/coreplugin/fileiconprovider.h
+++ b/src/plugins/coreplugin/fileiconprovider.h
@@ -44,10 +44,10 @@ CORE_EXPORT QIcon icon(QFileIconProvider::IconType type);
 // Register additional overlay icons
 CORE_EXPORT QPixmap overlayIcon(const QPixmap &baseIcon, const QIcon &overlayIcon);
 CORE_EXPORT QPixmap overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlayIcon, const QSize &size);
-CORE_EXPORT void registerIconOverlayForSuffix(const char *path, const char *suffix);
-CORE_EXPORT void registerIconOverlayForFilename(const char *path, const char *filename);
-CORE_EXPORT void registerIconOverlayForMimeType(const char *path, const char *mimeType);
-CORE_EXPORT void registerIconOverlayForMimeType(const QIcon &icon, const char *mimeType);
+CORE_EXPORT void registerIconOverlayForSuffix(const QString &path, const QString &suffix);
+CORE_EXPORT void registerIconOverlayForFilename(const QString &path, const QString &filename);
+CORE_EXPORT void registerIconOverlayForMimeType(const QString &path, const QString &mimeType);
+CORE_EXPORT void registerIconOverlayForMimeType(const QIcon &icon, const QString &mimeType);
 
 } // namespace FileIconProvider
 } // namespace Core
diff --git a/src/plugins/qmakeprojectmanager/profileeditor.cpp b/src/plugins/qmakeprojectmanager/profileeditor.cpp
index ac2b0f0e298..d9e12423598 100644
--- a/src/plugins/qmakeprojectmanager/profileeditor.cpp
+++ b/src/plugins/qmakeprojectmanager/profileeditor.cpp
@@ -195,11 +195,11 @@ ProFileEditorFactory::ProFileEditorFactory()
 
     const QString defaultOverlay = QLatin1String(ProjectExplorer::Constants::FILEOVERLAY_QT);
     Core::FileIconProvider::registerIconOverlayForSuffix(
-                creatorTheme()->imageFile(Theme::IconOverlayPro, defaultOverlay).toLatin1().data(), "pro");
+                creatorTheme()->imageFile(Theme::IconOverlayPro, defaultOverlay), "pro");
     Core::FileIconProvider::registerIconOverlayForSuffix(
-                creatorTheme()->imageFile(Theme::IconOverlayPri, defaultOverlay).toLatin1().data(), "pri");
+                creatorTheme()->imageFile(Theme::IconOverlayPri, defaultOverlay), "pri");
     Core::FileIconProvider::registerIconOverlayForSuffix(
-                creatorTheme()->imageFile(Theme::IconOverlayPrf, defaultOverlay).toLatin1().data(), "prf");
+                creatorTheme()->imageFile(Theme::IconOverlayPrf, defaultOverlay), "prf");
 }
 
 } // namespace Internal