diff --git a/src/game.c b/src/game.c
index 85f865d..5df7af3 100644
--- a/src/game.c
+++ b/src/game.c
@@ -5,6 +5,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 
 #include "ai.h"
diff --git a/src/map.c b/src/map.c
index 68e8282..ee45e4a 100644
--- a/src/map.c
+++ b/src/map.c
@@ -1,6 +1,7 @@
 #include "map.h"
 #include <stdlib.h>
 #include <stdbool.h>
+#include <string.h>
 #include "helper.h"
 #include "render.h"
 #include "res.h"
diff --git a/src/render.c b/src/render.c
index 670793c..8457e6f 100644
--- a/src/render.c
+++ b/src/render.c
@@ -2,6 +2,7 @@
 
 #include <SDL.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "ai.h"
 #include "game.h"
diff --git a/src/res.c b/src/res.c
index a3318af..35cd332 100644
--- a/src/res.c
+++ b/src/res.c
@@ -7,6 +7,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
+#include <ctype.h>
 #include "types.h"
 #include "render.h"
 #include "weapon.h"
diff --git a/src/storage.c b/src/storage.c
index aff671f..979d7ed 100644
--- a/src/storage.c
+++ b/src/storage.c
@@ -1,5 +1,7 @@
 #include "storage.h"
 
+#include <string.h>
+
 void readScore(FILE* f, Score* score) {
   fscanf(f, "%d %d %d %d\n", &score->damage, &score->stand, &score->killed,
          &score->got);
diff --git a/src/types.c b/src/types.c
index be609d8..9769cde 100644
--- a/src/types.c
+++ b/src/types.c
@@ -1,8 +1,10 @@
 #include "types.h"
 
 #include <SDL_ttf.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <string.h>
 
 #include "helper.h"
 #include "render.h"