diff --git a/src/help.c b/src/help.c
index 59389ae..a44e77b 100644
--- a/src/help.c
+++ b/src/help.c
@@ -20,6 +20,7 @@
  *
  */
 
+#include <stdlib.h>
 #include <string.h>
 
 #include "windows.h"
diff --git a/src/input.c b/src/input.c
index 4fd2b72..028ff06 100644
--- a/src/input.c
+++ b/src/input.c
@@ -24,6 +24,7 @@
 #define _GNU_SOURCE    /* needed for wcwidth() */
 #endif
 
+#include <stdlib.h>
 #include <wchar.h>
 
 #include "toxic.h"