diff --git a/src/hello.cpp b/src/hello.cpp
index c9cd849..83d59ea 100644
--- a/src/hello.cpp
+++ b/src/hello.cpp
@@ -151,11 +151,13 @@ int main()
     GLuint shaderProgram = compileShaderProgram();
     Icosphere sphere(2);
 
+    glEnable(GL_DEPTH_TEST);
+
     // Main loop
     while (!glfwWindowShouldClose(window))
     {
         glClearColor(0.2, 0.3, 0.3, 1.0);
-        glClear(GL_COLOR_BUFFER_BIT);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
         // Render everything with the same shaders
         glUseProgram(shaderProgram);