diff --git a/src/libsync/propagateupload.h b/src/libsync/propagateupload.h
index 7f94dfe662..e12e4500a5 100644
--- a/src/libsync/propagateupload.h
+++ b/src/libsync/propagateupload.h
@@ -408,8 +408,8 @@ private:
         QString originalName;
     };
 
-    QUrl chunkUploadFolderUrl() const;
-    QUrl chunkUrl(const int chunk) const;
+    [[nodiscard]] QUrl chunkUploadFolderUrl() const;
+    [[nodiscard]] QUrl chunkUrl(const int chunk) const;
 
     void startNewUpload();
     void startNextChunk();
diff --git a/src/libsync/syncoptions.h b/src/libsync/syncoptions.h
index 59fd233dc3..092ac6fb6f 100644
--- a/src/libsync/syncoptions.h
+++ b/src/libsync/syncoptions.h
@@ -70,11 +70,11 @@ public:
     static constexpr auto chunkV2MaxChunkSize = 5LL * 1000LL * 1000LL * 1000LL; // 5 GB
 
     /** The minimum chunk size in bytes for chunked uploads */
-    qint64 minChunkSize() const;
+    [[nodiscard]] qint64 minChunkSize() const;
     void setMinChunkSize(const qint64 minChunkSize);
 
     /** The maximum chunk size in bytes for chunked uploads */
-    qint64 maxChunkSize() const;
+    [[nodiscard]] qint64 maxChunkSize() const;
     void setMaxChunkSize(const qint64 maxChunkSize);
 
     /** Reads settings from env vars where available.