diff --git a/tests/clipboard.c b/tests/clipboard.c
index 7281a05d..90adc4b0 100644
--- a/tests/clipboard.c
+++ b/tests/clipboard.c
@@ -86,11 +86,6 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action,
     }
 }
 
-static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
-{
-    glViewport(0, 0, width, height);
-}
-
 int main(int argc, char** argv)
 {
     int ch;
@@ -132,7 +127,6 @@ int main(int argc, char** argv)
     glfwSwapInterval(1);
 
     glfwSetKeyCallback(window, key_callback);
-    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 
     glClearColor(0.5f, 0.5f, 0.5f, 0);
 
diff --git a/tests/events.c b/tests/events.c
index 094ea5f9..9a0144d7 100644
--- a/tests/events.c
+++ b/tests/events.c
@@ -289,8 +289,6 @@ static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
     Slot* slot = glfwGetWindowUserPointer(window);
     printf("%08x to %i at %0.3f: Framebuffer size: %i %i\n",
            counter++, slot->number, glfwGetTime(), width, height);
-
-    glViewport(0, 0, width, height);
 }
 
 static void window_content_scale_callback(GLFWwindow* window, float xscale, float yscale)
diff --git a/tests/iconify.c b/tests/iconify.c
index 8de892e3..4dd35c28 100644
--- a/tests/iconify.c
+++ b/tests/iconify.c
@@ -127,8 +127,6 @@ static void window_size_callback(GLFWwindow* window, int width, int height)
 static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
 {
     printf("%0.2f Framebuffer resized to %ix%i\n", glfwGetTime(), width, height);
-
-    glViewport(0, 0, width, height);
 }
 
 static void window_focus_callback(GLFWwindow* window, int focused)
diff --git a/tests/tearing.c b/tests/tearing.c
index eed4f04d..fe7ed076 100644
--- a/tests/tearing.c
+++ b/tests/tearing.c
@@ -92,11 +92,6 @@ static void error_callback(int error, const char* description)
     fprintf(stderr, "Error: %s\n", description);
 }
 
-static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
-{
-    glViewport(0, 0, width, height);
-}
-
 static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
 {
     if (action != GLFW_PRESS)
@@ -188,7 +183,6 @@ int main(int argc, char** argv)
     swap_tear = (glfwExtensionSupported("WGL_EXT_swap_control_tear") ||
                  glfwExtensionSupported("GLX_EXT_swap_control_tear"));
 
-    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
     glfwSetKeyCallback(window, key_callback);
 
     glGenBuffers(1, &vertex_buffer);
@@ -217,9 +211,13 @@ int main(int argc, char** argv)
 
     while (!glfwWindowShouldClose(window))
     {
+        int width, height;
         mat4x4 m, p, mvp;
         float position = cosf((float) glfwGetTime() * 4.f) * 0.75f;
 
+        glfwGetFramebufferSize(window, &width, &height);
+
+        glViewport(0, 0, width, height);
         glClear(GL_COLOR_BUFFER_BIT);
 
         mat4x4_ortho(p, -1.f, 1.f, -1.f, 1.f, 0.f, 1.f);
diff --git a/tests/title.c b/tests/title.c
index 41e91712..d6a3dc5e 100644
--- a/tests/title.c
+++ b/tests/title.c
@@ -38,11 +38,6 @@ static void error_callback(int error, const char* description)
     fprintf(stderr, "Error: %s\n", description);
 }
 
-static void framebuffer_size_callback(GLFWwindow* window, int width, int height)
-{
-    glViewport(0, 0, width, height);
-}
-
 int main(void)
 {
     GLFWwindow* window;
@@ -63,8 +58,6 @@ int main(void)
     gladLoadGLLoader((GLADloadproc) glfwGetProcAddress);
     glfwSwapInterval(1);
 
-    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
-
     while (!glfwWindowShouldClose(window))
     {
         glClear(GL_COLOR_BUFFER_BIT);