diff --git a/unix/input.c b/unix/input.c
index 0774503d9084dd20cef69a5c4b59ce80bfa952b4..06190306ab242f2bd0cd424c23a1f1acbc9d98e4 100644
--- a/unix/input.c
+++ b/unix/input.c
@@ -24,6 +24,7 @@
  * THE SOFTWARE.
  */
 
+#include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>