diff --git a/examples/opengl3_example/Makefile b/examples/opengl3_example/Makefile
index fa2665f7..c67ff83b 100644
--- a/examples/opengl3_example/Makefile
+++ b/examples/opengl3_example/Makefile
@@ -10,7 +10,7 @@
 
 #CXX = g++
 
-OBJS = main.o
+OBJS = main.o imgui_impl_glfw_gl3.o
 OBJS += ../../imgui.o
 OBJS += ../opengl_example/gl3w/GL/gl3w.o