diff --git a/freeglut/freeglut/freeglut.dsp b/freeglut/freeglut/freeglut.dsp
index f0f022a..17836a0 100644
--- a/freeglut/freeglut/freeglut.dsp
+++ b/freeglut/freeglut/freeglut.dsp
@@ -155,6 +155,10 @@ SOURCE=.\src\freeglut_overlay.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\src\freeglut_spaceball.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\src\freeglut_state.c
 # End Source File
 # Begin Source File
diff --git a/freeglut/freeglut/freeglut_static.dsp b/freeglut/freeglut/freeglut_static.dsp
index b20aad1..e7443d1 100644
--- a/freeglut/freeglut/freeglut_static.dsp
+++ b/freeglut/freeglut/freeglut_static.dsp
@@ -149,6 +149,10 @@ SOURCE=.\src\freeglut_overlay.c
 # End Source File
 # Begin Source File
 
+SOURCE=.\src\freeglut_spaceball.c
+# End Source File
+# Begin Source File
+
 SOURCE=.\src\freeglut_state.c
 # End Source File
 # Begin Source File