diff --git a/recipes/gears/gears.c b/recipes/gears/gears.c
index 4f0e03872..14508dc62 100644
--- a/recipes/gears/gears.c
+++ b/recipes/gears/gears.c
@@ -14,6 +14,7 @@
 #include <GL/glu.h>
 #include <GL/osmesa.h>
 #include <orbital.h>
+#include <stdio.h>
 
 #ifndef M_PI
 #define M_PI 3.14159265