diff --git a/src/ExportManager.h b/src/ExportManager.h
--- a/src/ExportManager.h
+++ b/src/ExportManager.h
@@ -26,6 +26,7 @@
 #include <QPixmap>
 #include <QDateTime>
 #include <QUrl>
+#include <QDir>
 
 #include "PlatformBackends/ImageGrabber.h"
 
@@ -93,8 +94,10 @@
     QString truncatedFilename(const QString &filename);
     QString makeAutosaveFilename();
     using FileNameAlreadyUsedCheck = bool (ExportManager::*)(const QUrl&) const;
-    QString autoIncrementFilename(const QString &baseName, const QString &extension,
-                                  FileNameAlreadyUsedCheck isFileNameUsed);
+    QUrl autoIncrementFilename(const QDir &baseDir,
+                               const QString &fileName,
+                               const QString &extension,
+                               FileNameAlreadyUsedCheck isFileNameUsed);
     QString makeSaveMimetype(const QUrl &url);
     bool writeImage(QIODevice *device, const QByteArray &format);
     bool save(const QUrl &url);
diff --git a/src/ExportManager.cpp b/src/ExportManager.cpp
--- a/src/ExportManager.cpp
+++ b/src/ExportManager.cpp
@@ -19,7 +19,6 @@
 
 #include "ExportManager.h"
 
-#include <QDir>
 #include <QMimeDatabase>
 #include <QImageWriter>
 #include <QTemporaryDir>
@@ -149,12 +148,11 @@
 {
     const QString baseDir = saveLocation();
     const QDir baseDirPath(baseDir);
-    const QString filename = makeAutosaveFilename();
-    const QString fullpath = autoIncrementFilename(baseDirPath.filePath(filename),
+    const QString fileName = makeAutosaveFilename();
+    const QUrl fileNameUrl = autoIncrementFilename(baseDirPath,
+                                                   fileName,
                                                    SpectacleConfig::instance()->saveImageFormat(),
                                                    &ExportManager::isFileExists);
-
-    const QUrl fileNameUrl = QUrl::fromUserInput(fullpath);
     if (fileNameUrl.isValid()) {
         return fileNameUrl;
     } else {
@@ -215,27 +213,32 @@
     return truncatedFilename(result);
 }
 
-QString ExportManager::autoIncrementFilename(const QString &baseName, const QString &extension,
-                                             FileNameAlreadyUsedCheck isFileNameUsed)
+QUrl ExportManager::autoIncrementFilename(const QDir &baseDir,
+                                          const QString &fileName,
+                                          const QString &extension,
+                                          FileNameAlreadyUsedCheck isFileNameUsed)
 {
-    QString result = truncatedFilename(baseName) + QLatin1Literal(".") + extension;
-    if (!((this->*isFileNameUsed)(QUrl::fromUserInput(result)))) {
-        return result;
+    const QString resultFileName = fileName.isEmpty() ? QStringLiteral("1") : fileName;
+    const QString resultFilePath = baseDir.filePath(resultFileName) + QLatin1Char('.') + extension;
+
+    const QUrl filePath = QUrl::fromUserInput(resultFilePath);
+    if (!((this->*isFileNameUsed)(filePath))) {
+        return filePath;
     }
 
-    QString fileNameFmt = truncatedFilename(baseName) + QStringLiteral("-%1.");
+    const QString fileNameFmt = fileName.isEmpty() ? QStringLiteral("%1") : fileName + QStringLiteral("-%1");
+    const QString filePathFmt = baseDir.filePath(fileNameFmt) + QLatin1Char('.') + extension;
+
     for (quint64 i = 1; i < std::numeric_limits<quint64>::max(); i++) {
-        result = fileNameFmt.arg(i) + extension;
-        if (!((this->*isFileNameUsed)(QUrl::fromUserInput(result)))) {
-            return result;
+        const QUrl incrementedNumberFilePath = QUrl::fromUserInput(filePathFmt.arg(i));
+        if (!((this->*isFileNameUsed)(incrementedNumberFilePath))) {
+            return incrementedNumberFilePath;
         }
     }
 
-    // unlikely this will ever happen, but just in case we've run
-    // out of numbers
-
-    result = fileNameFmt.arg(QStringLiteral("OVERFLOW-") + QString::number(qrand() % 10000));
-    return truncatedFilename(result) + extension;
+    // unlikely this will ever happen, but just in case we've run out of numbers
+    const QString overflowNumberFilePath = filePathFmt.arg(QStringLiteral("OVERFLOW-") + QString::number(qrand() % 10000));
+    return QUrl::fromUserInput(overflowNumberFilePath);
 }
 
 QString ExportManager::makeSaveMimetype(const QUrl &url)
@@ -344,10 +347,9 @@
         // supports the use-case of creating multiple screenshots in a row
         // and exporting them to the same destination e.g. via clipboard,
         // where the temp file name is used as filename suggestion
-        const QString baseFileName = mTempDir->path() + QDir::separator() + makeAutosaveFilename();
-        const QString fileName = autoIncrementFilename(baseFileName, mimetype,
-                                                       &ExportManager::isTempFileAlreadyUsed);
-        QFile tmpFile(fileName);
+        const QUrl filePath = autoIncrementFilename(mTempDir->path(), makeAutosaveFilename(), mimetype,
+                                                    &ExportManager::isTempFileAlreadyUsed);
+        QFile tmpFile(filePath.toLocalFile());
         if (tmpFile.open(QFile::WriteOnly)) {
             if(writeImage(&tmpFile, mimetype.toLatin1())) {
                 mTempFile = QUrl::fromLocalFile(tmpFile.fileName());
@@ -430,8 +432,14 @@
     QFileDialog dialog(parentWindow);
     dialog.setAcceptMode(QFileDialog::AcceptSave);
     dialog.setFileMode(QFileDialog::AnyFile);
-    dialog.setDirectoryUrl(config->lastSaveAsLocation());
-    dialog.selectFile(makeAutosaveFilename() + QStringLiteral(".png"));
+    const QUrl saveAsLocation = config->lastSaveAsLocation();
+    dialog.setDirectoryUrl(saveAsLocation);
+    const QDir baseDirPath(saveAsLocation.toString());
+    const QUrl fullPath = autoIncrementFilename(baseDirPath,
+                                                makeAutosaveFilename(),
+                                                QStringLiteral("png"),
+                                                &ExportManager::isFileExists);
+    dialog.selectFile(fullPath.fileName());
     dialog.setDefaultSuffix(QStringLiteral(".png"));
     dialog.setMimeTypeFilters(supportedFilters);
     dialog.selectMimeTypeFilter(QStringLiteral("image/png"));