diff --git a/CommunityToolkit.Mvvm.SourceGenerators/Attributes/NullabilityAttributesGenerator.cs b/CommunityToolkit.Mvvm.SourceGenerators/Attributes/NullabilityAttributesGenerator.cs
index 147e9a95e..cfb540200 100644
--- a/CommunityToolkit.Mvvm.SourceGenerators/Attributes/NullabilityAttributesGenerator.cs
+++ b/CommunityToolkit.Mvvm.SourceGenerators/Attributes/NullabilityAttributesGenerator.cs
@@ -44,7 +44,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             string source = LoadAttributeSourceWithMetadataName(NotNullAttributeMetadataName);
 
-            context.AddSource(NotNullAttributeMetadataName, source);
+            context.AddSource($"{NotNullAttributeMetadataName}.g.cs", source);
         });
 
         // Check whether [NotNullIfNotNull] is not available
@@ -57,7 +57,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             string source = LoadAttributeSourceWithMetadataName(NotNullIfNotNullAttributeMetadataName);
 
-            context.AddSource(NotNullIfNotNullAttributeMetadataName, source);
+            context.AddSource($"{NotNullIfNotNullAttributeMetadataName}.g.cs", source);
         });
     }
 
diff --git a/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.cs b/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.cs
index bcb375227..e250abdac 100644
--- a/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.cs
+++ b/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservablePropertyGenerator.cs
@@ -95,7 +95,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
             // Insert all members into the same partial type declaration
             CompilationUnitSyntax compilationUnit = item.Hierarchy.GetCompilationUnit(memberDeclarations);
 
-            context.AddSource(item.Hierarchy.FilenameHint, compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource($"{item.Hierarchy.FilenameHint}.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
 
         // Gather all property changing names
@@ -113,7 +113,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
 
             if (compilationUnit is not null)
             {
-                context.AddSource("__KnownINotifyPropertyChangingArgs", compilationUnit.GetText(Encoding.UTF8));
+                context.AddSource("__KnownINotifyPropertyChangingArgs.g.cs", compilationUnit.GetText(Encoding.UTF8));
             }
         });
 
@@ -132,7 +132,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
 
             if (compilationUnit is not null)
             {
-                context.AddSource("__KnownINotifyPropertyChangedArgs", compilationUnit.GetText(Encoding.UTF8));
+                context.AddSource("__KnownINotifyPropertyChangedArgs.g.cs", compilationUnit.GetText(Encoding.UTF8));
             }
         });
     }
diff --git a/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservableValidatorValidateAllPropertiesGenerator.cs b/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservableValidatorValidateAllPropertiesGenerator.cs
index 6273285e6..42029748b 100644
--- a/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservableValidatorValidateAllPropertiesGenerator.cs
+++ b/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/ObservableValidatorValidateAllPropertiesGenerator.cs
@@ -59,7 +59,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             CompilationUnitSyntax compilationUnit = Execute.GetSyntax(item);
 
-            context.AddSource("__ObservableValidatorExtensions", compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource("__ObservableValidatorExtensions.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
 
         // Generate the class with all validation methods
@@ -67,7 +67,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             CompilationUnitSyntax compilationUnit = Execute.GetSyntax(item);
 
-            context.AddSource(item.FilenameHint, compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource($"{item.FilenameHint}.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
     }
 }
diff --git a/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/TransitiveMembersGenerator.cs b/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/TransitiveMembersGenerator.cs
index 17316ab35..82bdfbd87 100644
--- a/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/TransitiveMembersGenerator.cs
+++ b/CommunityToolkit.Mvvm.SourceGenerators/ComponentModel/TransitiveMembersGenerator.cs
@@ -122,7 +122,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
             ImmutableArray<MemberDeclarationSyntax> filteredMemberDeclarations = FilterDeclaredMembers(item.Info, sourceMemberDeclarations);
             CompilationUnitSyntax compilationUnit = item.Hierarchy.GetCompilationUnit(filteredMemberDeclarations, this.classDeclaration.BaseList);
 
-            context.AddSource(item.Hierarchy.FilenameHint, compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource($"{item.Hierarchy.FilenameHint}.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
     }
 
diff --git a/CommunityToolkit.Mvvm.SourceGenerators/Input/ICommandGenerator.cs b/CommunityToolkit.Mvvm.SourceGenerators/Input/ICommandGenerator.cs
index 0cc82aa90..0d9f7a6c5 100644
--- a/CommunityToolkit.Mvvm.SourceGenerators/Input/ICommandGenerator.cs
+++ b/CommunityToolkit.Mvvm.SourceGenerators/Input/ICommandGenerator.cs
@@ -69,7 +69,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
             ImmutableArray<MemberDeclarationSyntax> memberDeclarations = Execute.GetSyntax(item.Info);
             CompilationUnitSyntax compilationUnit = item.Hierarchy.GetCompilationUnit(memberDeclarations);
 
-            context.AddSource($"{item.Hierarchy.FilenameHint}.{item.Info.MethodName}", compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource($"{item.Hierarchy.FilenameHint}.{item.Info.MethodName}.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
     }
 }
diff --git a/CommunityToolkit.Mvvm.SourceGenerators/Messaging/IMessengerRegisterAllGenerator.cs b/CommunityToolkit.Mvvm.SourceGenerators/Messaging/IMessengerRegisterAllGenerator.cs
index b3029c2db..dcb5f6633 100644
--- a/CommunityToolkit.Mvvm.SourceGenerators/Messaging/IMessengerRegisterAllGenerator.cs
+++ b/CommunityToolkit.Mvvm.SourceGenerators/Messaging/IMessengerRegisterAllGenerator.cs
@@ -67,7 +67,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             CompilationUnitSyntax compilationUnit = Execute.GetSyntax(item);
 
-            context.AddSource("__IMessengerExtensions", compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource("__IMessengerExtensions.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
 
         // Generate the class with all registration methods
@@ -75,7 +75,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             CompilationUnitSyntax compilationUnit = Execute.GetSyntax(item);
 
-            context.AddSource(item.FilenameHint, compilationUnit.GetText(Encoding.UTF8));
+            context.AddSource($"{item.FilenameHint}.g.cs", compilationUnit.GetText(Encoding.UTF8));
         });
     }
 }