diff --git a/src/null_monitor.c b/src/null_monitor.c
index c07d330f..63a1cd20 100644
--- a/src/null_monitor.c
+++ b/src/null_monitor.c
@@ -120,9 +120,11 @@ GLFWbool _glfwGetGammaRampNull(_GLFWmonitor* monitor, GLFWgammaramp* ramp)
 {
     if (!monitor->null.ramp.size)
     {
+        unsigned int i;
+
         _glfwAllocGammaArrays(&monitor->null.ramp, 256);
 
-        for (unsigned int i = 0;  i < monitor->null.ramp.size;  i++)
+        for (i = 0;  i < monitor->null.ramp.size;  i++)
         {
             const float gamma = 2.2f;
             float value;
diff --git a/src/null_window.c b/src/null_window.c
index 25909c6e..10c5293f 100644
--- a/src/null_window.c
+++ b/src/null_window.c
@@ -426,13 +426,15 @@ void _glfwHideWindowNull(_GLFWwindow* window)
 
 void _glfwFocusWindowNull(_GLFWwindow* window)
 {
+    _GLFWwindow* previous;
+
     if (_glfw.null.focusedWindow == window)
         return;
 
     if (!window->null.visible)
         return;
 
-    _GLFWwindow* previous = _glfw.null.focusedWindow;
+    previous = _glfw.null.focusedWindow;
     _glfw.null.focusedWindow = window;
 
     if (previous)