diff --git a/src/Spring/Spring.Scheduling.Quartz/Spring.Scheduling.Quartz.2003.csproj b/src/Spring/Spring.Scheduling.Quartz/Spring.Scheduling.Quartz.2003.csproj
index 30b31b78..9d81f9be 100644
--- a/src/Spring/Spring.Scheduling.Quartz/Spring.Scheduling.Quartz.2003.csproj
+++ b/src/Spring/Spring.Scheduling.Quartz/Spring.Scheduling.Quartz.2003.csproj
@@ -183,6 +183,16 @@
                     SubType = "Code"
                     BuildAction = "Compile"
                 />
+                <File
+                    RelPath = "Scheduling\Quartz\SchedulerAccessor.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
+                <File
+                    RelPath = "Scheduling\Quartz\SchedulerAccessorObject.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
                 <File
                     RelPath = "Scheduling\Quartz\SchedulerFactoryObject.cs"
                     SubType = "Code"