diff --git a/firmware/target/hosted/sdl/button-sdl.c b/firmware/target/hosted/sdl/button-sdl.c
index 51ba8cf..cfe08de 100644
--- a/firmware/target/hosted/sdl/button-sdl.c
+++ b/firmware/target/hosted/sdl/button-sdl.c
@@ -20,6 +20,7 @@
  ****************************************************************************/

 #include <math.h>
+#include <stdlib.h>         /* EXIT_SUCCESS */
 #include "sim-ui-defines.h"
 #include "lcd-charcells.h"
 #include "lcd-remote.h"