diff --git a/photon/libc/stdio/fputc.c b/photon/libc/stdio/fputc.c
index bac9bbd..ef4838e 100644
--- a/photon/libc/stdio/fputc.c
+++ b/photon/libc/stdio/fputc.c
@@ -3,7 +3,8 @@
 
 int fputc(int c, FILE *fp)
 {
-    __fio_write(fp, &c, 1);
+    char ch = c;
+    __fio_write(fp, &ch, 1);
     if (__fio_error(fp)) {
         return EOF;
     }