diff --git a/src/libsync/clientsideencryption.cpp b/src/libsync/clientsideencryption.cpp
index 118a6084c2..0c07ec8b11 100644
--- a/src/libsync/clientsideencryption.cpp
+++ b/src/libsync/clientsideencryption.cpp
@@ -1279,9 +1279,9 @@ QVector<EncryptedFile> FolderMetadata::files() const {
     return _files;
 }
 
-bool ClientSideEncryption::isFolderEncrypted(const QString& path) {
-  auto it = _folder2encryptedStatus.find(path);
-  if (it == _folder2encryptedStatus.end())
+bool ClientSideEncryption::isFolderEncrypted(const QString& path) const {
+  auto it = _folder2encryptedStatus.constFind(path);
+  if (it == _folder2encryptedStatus.constEnd())
     return false;
   return (*it);
 }
diff --git a/src/libsync/clientsideencryption.h b/src/libsync/clientsideencryption.h
index 7d5810a8da..b5ffab5dcd 100644
--- a/src/libsync/clientsideencryption.h
+++ b/src/libsync/clientsideencryption.h
@@ -81,7 +81,7 @@ public:
     void fetchFolderEncryptedStatus();
 
     // to be used together with FolderStatusModel::FolderInfo::_path.
-    bool isFolderEncrypted(const QString& path);
+    bool isFolderEncrypted(const QString& path) const;
     void setFolderEncryptedStatus(const QString& path, bool status);
 
     void forgetSensitiveData();