diff --git a/tests/est-epsilon.c b/tests/est-epsilon.c
index e7babeb1c..d51fa204c 100644
--- a/tests/est-epsilon.c
+++ b/tests/est-epsilon.c
@@ -8,7 +8,7 @@
 
 #include <stdio.h>
 
-#include GLUT_H
+#include FG_GLUT_H
 
 
 int main() {
diff --git a/tests/gl-info.c b/tests/gl-info.c
index 746df1e97..6cc25d6d1 100644
--- a/tests/gl-info.c
+++ b/tests/gl-info.c
@@ -18,7 +18,7 @@ Date: Fri, 24 Apr 1998 07:33:51 -0800
 #include <stdio.h>
 #include <stdlib.h>
 
-#include GLUT_H
+#include FG_GLUT_H
 
 
 void getPrints ( GLenum token, char *string )
diff --git a/tests/test-env-map.cxx b/tests/test-env-map.cxx
index 6595c37cf..6e372281f 100644
--- a/tests/test-env-map.cxx
+++ b/tests/test-env-map.cxx
@@ -10,7 +10,7 @@
 #include <stdio.h>
 #include <math.h>
 
-#include GLUT_H
+#include FG_GLUT_H
 
 #define TEXRES_X 256
 #define TEXRES_Y 256