diff --git a/src/common.c b/src/common.c
index 6373a30..2715979 100644
--- a/src/common.c
+++ b/src/common.c
@@ -464,6 +464,7 @@ int recent_seqno(int ourseqno, int gotseqno)
 	return 0;
 }
 
+#ifndef WINDOWS32
 /* Set FD_CLOEXEC flag on file descriptor.
  * This stops it from being inherited by system() calls.
  */
@@ -479,3 +480,5 @@ fd_set_close_on_exec(int fd)
 	if (fcntl(fd, F_SETFD, flags) == -1)
 		err(4, "Failed to set fd flags");
 }
+#endif
+
diff --git a/src/common.h b/src/common.h
index 7b91942..f363ea5 100644
--- a/src/common.h
+++ b/src/common.h
@@ -136,6 +136,8 @@ void warnx(const char *fmt, ...);
 
 int recent_seqno(int , int);
 
+#ifndef WINDOWS32
 void fd_set_close_on_exec(int fd);
+#endif
 
 #endif