diff --git a/examples/testbed/framework/draw_gl4.h b/examples/testbed/framework/draw_gl4.h
index d324c5a..0ebab4c 100644
--- a/examples/testbed/framework/draw_gl4.h
+++ b/examples/testbed/framework/draw_gl4.h
@@ -16,6 +16,9 @@
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
+#ifndef DRAW_GL4_H
+#define DRAW_GL4_H
+
 #include <testbed/framework/draw.h> 
 
 #include <glad_4/glad.h>
@@ -1038,4 +1041,6 @@ struct DrawSolid
 
 	DrawSolidSphere m_sphere;
 	DrawSolidCylinder m_cylinder;
-};
\ No newline at end of file
+};
+
+#endif
\ No newline at end of file