diff --git a/libguile/fports.c b/libguile/fports.c
index 7af5f6a27..ffd929e2e 100644
--- a/libguile/fports.c
+++ b/libguile/fports.c
@@ -37,8 +37,6 @@
 #endif
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
-#else
-size_t fwrite ();
 #endif
 #ifdef HAVE_IO_H
 #include <io.h>