diff --git a/Content.Shared/Atmos/Components/GasTileOverlayComponent.cs b/Content.Shared/Atmos/Components/GasTileOverlayComponent.cs
index b97da1d30c..e72a1d6758 100644
--- a/Content.Shared/Atmos/Components/GasTileOverlayComponent.cs
+++ b/Content.Shared/Atmos/Components/GasTileOverlayComponent.cs
@@ -39,7 +39,7 @@ public sealed class GasTileOverlayState : ComponentState, IComponentDeltaState
         Chunks = chunks;
     }
 
-    public void ApplyToFullState(ComponentState fullState)
+    public void ApplyToFullState(IComponentState fullState)
     {
         DebugTools.Assert(!FullState);
         var state = (GasTileOverlayState) fullState;
@@ -57,7 +57,7 @@ public sealed class GasTileOverlayState : ComponentState, IComponentDeltaState
         }
     }
 
-    public ComponentState CreateNewFullState(ComponentState fullState)
+    public IComponentState CreateNewFullState(IComponentState fullState)
     {
         DebugTools.Assert(!FullState);
         var state = (GasTileOverlayState) fullState;
diff --git a/Content.Shared/Decals/DecalGridComponent.cs b/Content.Shared/Decals/DecalGridComponent.cs
index aa366f28c9..140eb5bafc 100644
--- a/Content.Shared/Decals/DecalGridComponent.cs
+++ b/Content.Shared/Decals/DecalGridComponent.cs
@@ -78,7 +78,7 @@ namespace Content.Shared.Decals
             Chunks = chunks;
         }
 
-        public void ApplyToFullState(ComponentState fullState)
+        public void ApplyToFullState(IComponentState fullState)
         {
             DebugTools.Assert(!FullState);
             var state = (DecalGridState) fullState;
@@ -96,7 +96,7 @@ namespace Content.Shared.Decals
             }
         }
 
-        public ComponentState CreateNewFullState(ComponentState fullState)
+        public IComponentState CreateNewFullState(IComponentState fullState)
         {
             DebugTools.Assert(!FullState);
             var state = (DecalGridState) fullState;