diff --git a/exosphere/gcm.c b/exosphere/gcm.c
index 15040b4df..9aa6233f7 100644
--- a/exosphere/gcm.c
+++ b/exosphere/gcm.c
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <string.h>
 
 #include "utils.h"
 #include "gcm.h"
diff --git a/exosphere/package2.c b/exosphere/package2.c
index 8cf0695a6..b2574c64c 100644
--- a/exosphere/package2.c
+++ b/exosphere/package2.c
@@ -1,5 +1,6 @@
 #include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
 
 #include "utils.h"
 
diff --git a/exosphere/randomcache.c b/exosphere/randomcache.c
index e9e50ecbc..a941cd304 100644
--- a/exosphere/randomcache.c
+++ b/exosphere/randomcache.c
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <string.h>
 
 #include "utils.h"
 #include "randomcache.h"
diff --git a/exosphere/smc_user.c b/exosphere/smc_user.c
index 511857d7e..b7cf28500 100644
--- a/exosphere/smc_user.c
+++ b/exosphere/smc_user.c
@@ -1,5 +1,6 @@
 #include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
 
 #include "utils.h"
 #include "cache.h"
diff --git a/exosphere/titlekey.c b/exosphere/titlekey.c
index c4786a132..91a6116c8 100644
--- a/exosphere/titlekey.c
+++ b/exosphere/titlekey.c
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <string.h>
 
 #include "utils.h"
 
diff --git a/exosphere/userpage.c b/exosphere/userpage.c
index 6fdcc3cf4..fe2c23124 100644
--- a/exosphere/userpage.c
+++ b/exosphere/userpage.c
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <string.h>
 
 #include "utils.h"
 #include "userpage.h"