diff --git a/src/Lamar/IoC/Enumerables/ArrayInstance.cs b/src/Lamar/IoC/Enumerables/ArrayInstance.cs
index 0f7ca3a5..ac92b01f 100644
--- a/src/Lamar/IoC/Enumerables/ArrayInstance.cs
+++ b/src/Lamar/IoC/Enumerables/ArrayInstance.cs
@@ -63,7 +63,13 @@ protected override IEnumerable<Instance> createPlan(ServiceGraph services)
         }
         else
         {
-            Elements = services.FindAll(typeof(T));
+            // MS DI's IServiceProvider.GetServices(T) (and by extension T[] resolution) returns
+            // only non-keyed registrations; keyed registrations are looked up explicitly via
+            // GetKeyedService(T, key). Match that here so a keyed-mirror registration of the
+            // same service type doesn't end up as a T[] element. Otherwise inlining the
+            // mirror's Singleton via QuickResolve invokes the mirror's factory, which calls
+            // sp.GetServices(T) again and recursively re-enters codegen — stack overflow.
+            Elements = services.FindAll(typeof(T)).Where(x => !x.IsKeyedService).ToArray();
         }
 
         return Elements;
diff --git a/src/Lamar/IoC/Enumerables/ListInstance.cs b/src/Lamar/IoC/Enumerables/ListInstance.cs
index 494c723d..ef68c386 100644
--- a/src/Lamar/IoC/Enumerables/ListInstance.cs
+++ b/src/Lamar/IoC/Enumerables/ListInstance.cs
@@ -56,7 +56,13 @@ protected override IEnumerable<Instance> createPlan(ServiceGraph services)
         }
         else
         {
-            Elements = services.FindAll(typeof(T));
+            // MS DI's IServiceProvider.GetServices(T) returns only non-keyed registrations;
+            // keyed registrations are looked up explicitly via GetKeyedService(T, key). Match
+            // that here so a keyed-mirror registration of the same service type doesn't end up
+            // as an IEnumerable<T> element. Otherwise inlining the mirror's Singleton via
+            // QuickResolve invokes the mirror's factory, which calls sp.GetServices(T) again
+            // and recursively re-enters ListInstance/ArrayInstance code-gen — stack overflow.
+            Elements = services.FindAll(typeof(T)).Where(x => !x.IsKeyedService).ToArray();
         }
 
         return Elements;