diff --git a/docs/en/Tutorials/Part-10.md b/docs/en/Tutorials/Part-10.md
index bc1591fc60..d06cea6b6e 100644
--- a/docs/en/Tutorials/Part-10.md
+++ b/docs/en/Tutorials/Part-10.md
@@ -626,7 +626,7 @@ public abstract class BookAppService_Tests<TStartupModule> : BookStoreApplicatio
     private readonly IBookAppService _bookAppService;
     private readonly IAuthorAppService _authorAppService;
 
-    public BookAppService_Tests()
+    protected BookAppService_Tests()
     {
         _bookAppService = GetRequiredService<IBookAppService>();
         _authorAppService = GetRequiredService<IAuthorAppService>();
diff --git a/docs/en/Tutorials/Part-4.md b/docs/en/Tutorials/Part-4.md
index d229cfabdd..c97bce6bd7 100644
--- a/docs/en/Tutorials/Part-4.md
+++ b/docs/en/Tutorials/Part-4.md
@@ -93,7 +93,7 @@ public abstract class BookAppService_Tests<TStartupModule> : BookStoreApplicatio
 {
     private readonly IBookAppService _bookAppService;
 
-    public BookAppService_Tests()
+    protected BookAppService_Tests()
     {
         _bookAppService = GetRequiredService<IBookAppService>();
     }
@@ -219,7 +219,7 @@ public abstract class BookAppService_Tests<TStartupModule> : BookStoreApplicatio
 {
     private readonly IBookAppService _bookAppService;
 
-    public BookAppService_Tests()
+    protected BookAppService_Tests()
     {
         _bookAppService = GetRequiredService<IBookAppService>();
     }