diff --git a/src/libsodium/crypto_pwhash/argon2/argon2-core.c b/src/libsodium/crypto_pwhash/argon2/argon2-core.c
index 51706c1b..984dbc52 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2-core.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2-core.c
@@ -12,8 +12,8 @@
  */
 
 #include <errno.h>
+#include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c b/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
index 6a80afe0..13f4156c 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2-encoding.c
@@ -2,7 +2,7 @@
 #include "argon2-core.h"
 #include "utils.h"
 #include <limits.h>
-#include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/src/libsodium/crypto_pwhash/argon2/argon2.c b/src/libsodium/crypto_pwhash/argon2/argon2.c
index 4d69f117..e67f5efd 100644
--- a/src/libsodium/crypto_pwhash/argon2/argon2.c
+++ b/src/libsodium/crypto_pwhash/argon2/argon2.c
@@ -12,8 +12,8 @@
  */
 
 #include <limits.h>
+#include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/src/libsodium/include/sodium/crypto_onetimeauth_poly1305.h b/src/libsodium/include/sodium/crypto_onetimeauth_poly1305.h
index 1565d37a..54e556d1 100644
--- a/src/libsodium/include/sodium/crypto_onetimeauth_poly1305.h
+++ b/src/libsodium/include/sodium/crypto_onetimeauth_poly1305.h
@@ -1,8 +1,8 @@
 #ifndef crypto_onetimeauth_poly1305_H
 #define crypto_onetimeauth_poly1305_H
 
+#include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
 #include <stdlib.h>
 
 #include <sys/types.h>