diff --git a/process.c b/process.c
index f644029641..f7adcaf708 100644
--- a/process.c
+++ b/process.c
@@ -295,7 +295,7 @@ assert_close_on_exec(int fd)
         int flags = fcntl(fd, F_GETFD);
         if (flags == -1) {
                 static const char m[] = "reserved FD closed unexpectedly?\n";
-                write(2, m, sizeof(m) - 1);
+                (void)write(2, m, sizeof(m) - 1);
                 return;
         }
         if (flags & FD_CLOEXEC) return;