diff --git a/src/Generator/Passes/TrimSpecializationsPass.cs b/src/Generator/Passes/TrimSpecializationsPass.cs
index a7f46c39..9e3929f2 100644
--- a/src/Generator/Passes/TrimSpecializationsPass.cs
+++ b/src/Generator/Passes/TrimSpecializationsPass.cs
@@ -97,8 +97,15 @@ namespace CppSharp.Passes
         private void CleanSpecializations(Class template)
         {
             template.Specializations.RemoveAll(s =>
-                s.SpecializationKind == TemplateSpecializationKind.Undeclared ||
-                (!specializations.Contains(s) && !internalSpecializations.Contains(s)));
+                {
+                    if (s.SpecializationKind == TemplateSpecializationKind.Undeclared ||
+                        (!specializations.Contains(s) && !internalSpecializations.Contains(s)))
+                    {
+                        s.ExplicitlyIgnore();
+                        return true;
+                    }
+                    return false;
+                });
 
             foreach (var specialization in template.Specializations.Where(
                 s => s is ClassTemplatePartialSpecialization))
diff --git a/tests/NamespacesDerived/NamespacesDerived.cpp b/tests/NamespacesDerived/NamespacesDerived.cpp
index e5ad74e8..19d759a2 100644
--- a/tests/NamespacesDerived/NamespacesDerived.cpp
+++ b/tests/NamespacesDerived/NamespacesDerived.cpp
@@ -70,6 +70,11 @@ DerivedFromExternalSpecialization::~DerivedFromExternalSpecialization()
 {
 }
 
+TemplateWithIndependentFields<Base3> DerivedFromExternalSpecialization::returnExternalSpecialization()
+{
+    return TemplateWithIndependentFields<Base3>();
+}
+
 HasVirtualInDependency::HasVirtualInDependency()
 {
 }
diff --git a/tests/NamespacesDerived/NamespacesDerived.h b/tests/NamespacesDerived/NamespacesDerived.h
index 2d70943e..862acd12 100644
--- a/tests/NamespacesDerived/NamespacesDerived.h
+++ b/tests/NamespacesDerived/NamespacesDerived.h
@@ -76,6 +76,7 @@ class DLL_API DerivedFromExternalSpecialization : public TemplateWithIndependent
 public:
     DerivedFromExternalSpecialization();
     ~DerivedFromExternalSpecialization();
+    TemplateWithIndependentFields<Base3> returnExternalSpecialization();
 };
 
 class DLL_API DerivedFromSecondaryBaseInDependency : public Derived, public SecondaryBase