diff --git a/bazaar/FTGL_Demo/FTGL_Demo.upp b/bazaar/FTGL_Demo/FTGL_Demo.upp
index 4e703ad0a..87def7e3e 100644
--- a/bazaar/FTGL_Demo/FTGL_Demo.upp
+++ b/bazaar/FTGL_Demo/FTGL_Demo.upp
@@ -4,8 +4,8 @@ uses
 	GLCtrl;
 
 file
-	trackball.c,
-	trackball.h,
+	trkball.c,
+	trkball.h,
 	TrackBall.h,
 	TrackBall.cpp,
 	FTGLCtrl.h,
diff --git a/bazaar/FTGL_Demo/trackball.c b/bazaar/FTGL_Demo/trkball.c
similarity index 99%
rename from bazaar/FTGL_Demo/trackball.c
rename to bazaar/FTGL_Demo/trkball.c
index 6ac4c37e9..04346d431 100644
--- a/bazaar/FTGL_Demo/trackball.c
+++ b/bazaar/FTGL_Demo/trkball.c
@@ -52,7 +52,7 @@
  */
 
 #include <math.h>
-#include "trackball.h"
+#include "trkball.h"
 
 /*
  * This size should really be based on the distance from the center of
diff --git a/bazaar/FTGL_Demo/trackball.h b/bazaar/FTGL_Demo/trkball.h
similarity index 100%
rename from bazaar/FTGL_Demo/trackball.h
rename to bazaar/FTGL_Demo/trkball.h