diff --git a/src/win32_opengl.c b/src/win32_opengl.c
index fe1898e7..345b7289 100644
--- a/src/win32_opengl.c
+++ b/src/win32_opengl.c
@@ -30,6 +30,8 @@
 
 #include "internal.h"
 
+#include <stdlib.h>
+
 
 //========================================================================
 // Initialize WGL-specific extensions
diff --git a/tests/windows.c b/tests/windows.c
index 7b1a529c..894febeb 100644
--- a/tests/windows.c
+++ b/tests/windows.c
@@ -67,8 +67,8 @@ int main(void)
         glfwMakeContextCurrent(windows[i]);
         glClearColor((GLclampf) (i & 1),
                      (GLclampf) (i >> 1),
-                     i ? 0.0 : 1.0,
-                     0.0);
+                     i ? 0.f : 1.f,
+                     0.f);
 
         glfwSetWindowPos(windows[i], 100 + (i & 1) * 300, 100 + (i >> 1) * 300);
     }