diff --git a/kcms/kfontinst/kcmfontinst/FontsPackage.cpp b/kcms/kfontinst/kcmfontinst/FontsPackage.cpp
--- a/kcms/kfontinst/kcmfontinst/FontsPackage.cpp
+++ b/kcms/kfontinst/kcmfontinst/FontsPackage.cpp
@@ -77,12 +77,12 @@
                         // unhide 1st!
                         if(Misc::isHidden(name))
                         {
-                            ::rename(QFile::encodeName((*tempDir)->path()+QLatin1Char('/')+name).data(),
-                                     QFile::encodeName((*tempDir)->path()+QLatin1Char('/')+name.mid(1)).data());
+                            ::rename(QFile::encodeName((*tempDir)->filePath(name)).data(),
+                                     QFile::encodeName((*tempDir)->filePath(name.mid(1))).data());
                             name=name.mid(1);
                         }
 
-                        urls.insert(QUrl((*tempDir)->path()+QLatin1Char('/')+name));
+                        urls.insert(QUrl((*tempDir)->filePath(name)));
                     }
                 }
             }
diff --git a/kcms/kfontinst/kcmfontinst/JobRunner.cpp b/kcms/kfontinst/kcmfontinst/JobRunner.cpp
--- a/kcms/kfontinst/kcmfontinst/JobRunner.cpp
+++ b/kcms/kfontinst/kcmfontinst/JobRunner.cpp
@@ -713,7 +713,7 @@
                 itsTempDir->setAutoRemove(true);
             }
 
-            QString tempName(itsTempDir->path()+QLatin1Char('/')+Misc::getFile(url.path()));
+            QString tempName(itsTempDir->filePath(Misc::getFile(url.path())));
             auto job = KIO::file_copy(url, QUrl::fromLocalFile(tempName), -1, KIO::Overwrite);
             if (job->exec())
                 return tempName;
diff --git a/kcms/kfontinst/kio/KioFonts.cpp b/kcms/kfontinst/kio/KioFonts.cpp
--- a/kcms/kfontinst/kio/KioFonts.cpp
+++ b/kcms/kfontinst/kio/KioFonts.cpp
@@ -235,7 +235,7 @@
             itsTempDir->setAutoRemove(true);
         }
 
-        QString tempFile(itsTempDir->path()+QLatin1Char('/')+url.fileName());
+        QString tempFile(itsTempDir->filePath(url.fileName()));
         QFile   dest(tempFile);
 
         if (dest.open(QIODevice::WriteOnly))
diff --git a/kcms/kfontinst/thumbnail/FontThumbnail.cpp b/kcms/kfontinst/thumbnail/FontThumbnail.cpp
--- a/kcms/kfontinst/thumbnail/FontThumbnail.cpp
+++ b/kcms/kfontinst/thumbnail/FontThumbnail.cpp
@@ -91,16 +91,16 @@
 
                             ((KArchiveFile *)entry)->copyTo(tempDir->path());
 
-                            QString mime(db.mimeTypeForFile(tempDir->path()+QLatin1Char('/')+entry->name()).name());
+                            QString mime(db.mimeTypeForFile(tempDir->filePath(entry->name())).name());
 
                             if(mime=="font/ttf" || mime=="font/otf" || mime=="application/x-font-ttf" ||
                                mime=="application/x-font-otf" || mime=="application/x-font-type1")
                             {
-                                realPath=tempDir->path()+QLatin1Char('/')+entry->name();
+                                realPath=tempDir->filePath(entry->name());
                                 break;
                             }
                             else
-                                ::unlink(QFile::encodeName(tempDir->path()+QLatin1Char('/')+entry->name()).data());
+                                ::unlink(QFile::encodeName(tempDir->filePath(entry->name())).data());
                         }
                     }
                 }
diff --git a/kcms/kfontinst/viewpart/FontViewPart.cpp b/kcms/kfontinst/viewpart/FontViewPart.cpp
--- a/kcms/kfontinst/viewpart/FontViewPart.cpp
+++ b/kcms/kfontinst/viewpart/FontViewPart.cpp
@@ -317,18 +317,18 @@
                                 ((KArchiveFile *)entry)->copyTo(itsTempDir->path());
 
                                 QMimeDatabase db;
-                                QString mime(db.mimeTypeForFile(itsTempDir->path()+QLatin1Char('/')+entry->name()).name());
+                                QString mime(db.mimeTypeForFile(itsTempDir->filePath(entry->name())).name());
 
                                 if(mime=="font/ttf" || mime=="font/otf" || mime=="application/x-font-ttf" ||
                                    mime=="application/x-font-otf" || mime=="application/x-font-type1")
                                 {
-                                    fontFile=itsTempDir->path()+QLatin1Char('/')+entry->name();
+                                    fontFile=itsTempDir->filePath(entry->name());
                                     //setLocalFilePath(itsTempDir->path()+QLatin1Char('/')+entry->name());
 //                                    itsMetaUrl=QUrl::fromLocalFile(localFilePath());
                                     break;
                                 }
                                 else
-                                    ::unlink(QFile::encodeName(itsTempDir->path()+QLatin1Char('/')+entry->name()).data());
+                                    ::unlink(QFile::encodeName(itsTempDir->filePath(entry->name())).data());
                             }
                         }
                     }