diff --git a/backend/api/Controllers/SourceController.cs b/backend/api/Controllers/SourceController.cs
index 605c0e2be..323da4a86 100644
--- a/backend/api/Controllers/SourceController.cs
+++ b/backend/api/Controllers/SourceController.cs
@@ -31,7 +31,7 @@ public async Task<ActionResult<IList<Source>>> GetAllSources()
         List<Source> sources;
         try
         {
-            sources = await sourceService.ReadAll();
+            sources = await sourceService.ReadAll(readOnly: true);
         }
         catch (InvalidDataException e)
         {
diff --git a/backend/api/Services/SourceService.cs b/backend/api/Services/SourceService.cs
index 48dfade10..1527c66e4 100644
--- a/backend/api/Services/SourceService.cs
+++ b/backend/api/Services/SourceService.cs
@@ -10,7 +10,7 @@ public interface ISourceService
     {
         public abstract Task<Source> Create(Source source);
 
-        public abstract Task<List<Source>> ReadAll();
+        public abstract Task<List<Source>> ReadAll(bool readOnly = false);
 
         public abstract Task<Source?> ReadById(string id, bool readOnly = false);
 
@@ -44,9 +44,9 @@ public async Task<Source> Create(Source source)
             return source;
         }
 
-        public async Task<List<Source>> ReadAll()
+        public async Task<List<Source>> ReadAll(bool readOnly = false)
         {
-            var query = GetSources();
+            var query = GetSources(readOnly: readOnly);
 
             return await query.ToListAsync();
         }