diff --git a/progs/tests/bug_3101.c b/progs/tests/bug_3101.c
index fb9ebb10593..761dcbb9513 100644
--- a/progs/tests/bug_3101.c
+++ b/progs/tests/bug_3101.c
@@ -63,6 +63,8 @@ static void Display( void )
    glVertex2f(-1,  1);
    glEnd();
 
+   glPopMatrix();
+
    glutSwapBuffers();
 }