diff --git a/src/stdio/tempnam.c b/src/stdio/tempnam.c
index dc4f2bad0d14d90df5498dfdad1cbee7a0a123fb..f73ca9f9027f4cec78819da8b954fb7d932a837f 100644
--- a/src/stdio/tempnam.c
+++ b/src/stdio/tempnam.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <unistd.h>
 #include <time.h>
 #include "libc.h"
@@ -30,7 +31,7 @@ char *tempnam(const char *dir, const char *pfx)
 
 	do {
 		clock_gettime(CLOCK_REALTIME, &ts);
-		n = ts.tv_nsec ^ (unsigned)&s ^ (unsigned)s;
+		n = ts.tv_nsec ^ (uintptr_t)&s ^ (uintptr_t)s;
 		snprintf(s, l, "%s/%s-%d-%d-%x", dir, pfx, pid, a_fetch_add(&index, 1), n);
 	} while (!access(s, F_OK) && try++<MAXTRIES);
 	if (try>=MAXTRIES) {
diff --git a/src/stdio/tmpnam.c b/src/stdio/tmpnam.c
index 010cf039aac07ee84759c5f5b6950821b787fbec..2bd72b3b7a14baaf4e1e9d9db39e4f13105895a8 100644
--- a/src/stdio/tmpnam.c
+++ b/src/stdio/tmpnam.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
 #include <unistd.h>
 #include <time.h>
 #include "libc.h"
@@ -23,7 +24,7 @@ char *tmpnam(char *s)
 
 	do {
 		__syscall(SYS_clock_gettime, CLOCK_REALTIME, &ts, 0);
-		n = ts.tv_nsec ^ (unsigned)&s ^ (unsigned)s;
+		n = ts.tv_nsec ^ (uintptr_t)&s ^ (uintptr_t)s;
 		snprintf(s, L_tmpnam, "/tmp/t%x-%x", a_fetch_add(&index, 1), n);
 	} while (!__syscall(SYS_access, s, F_OK) && try++<MAXTRIES);
 	return try>=MAXTRIES ? 0 : s;