diff --git a/fdcreate.c b/fdcreate.c
index 089bf97..23812eb 100644
--- a/fdcreate.c
+++ b/fdcreate.c
@@ -1,7 +1,7 @@
 #include <sys/mman.h>
-#include <stdio.h>
 #include <stdlib.h>
 
+#include <skalibs/types.h>
 #include <skalibs/strerr2.h>
 #include <skalibs/env.h>
 #include <skalibs/exec.h>
@@ -10,12 +10,14 @@
 
 int main(int argc, char const *const *argv) {
 	PROG = "fdcreate";
+	char fd_str[10];
 
 	if (argc < 3) strerr_dieusage(100, USAGE);
 	int fd = memfd_create(argv[1], 0);
 	if (fd < 0) strerr_diefu1sys(111, "memfd_create");
-	char fd_str[10];
-	sprintf(fd_str, "%d", fd);
+
+	int_fmt(fd_str, fd);
+
 	setenv(argv[1], fd_str, 1);
 
 	xexec(argv+2);