diff --git a/src/player/src/human_player_gui.c b/src/player/src/human_player_gui.c
index 4e96133..27869a7 100644
--- a/src/player/src/human_player_gui.c
+++ b/src/player/src/human_player_gui.c
@@ -16,6 +16,7 @@
 #include <stddef.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <stdlib.h>
 
 enum {X_OFF = 8, Y_OFF = 8};
 
diff --git a/src/player/src/player.c b/src/player/src/player.c
index a3b0a52..04ed4bb 100644
--- a/src/player/src/player.c
+++ b/src/player/src/player.c
@@ -3,6 +3,7 @@
 #include <unit.h>
 #include <terrain.h>
 #include <stddef.h>
+#include <stdlib.h>
 
 void player_update(struct player *const p)
 {