diff --git a/include/wchar.h b/include/wchar.h
index 5bfac56df5e1..67f582cd0c18 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -180,7 +180,7 @@ extern struct __sFILE *__stderrp;
 
 #define	getwc(fp)	fgetwc(fp)
 #define	getwchar()	fgetwc(__stdinp)
-#define	putwc(wc, fp)	fputwc(x, fp)
+#define	putwc(wc, fp)	fputwc(wc, fp)
 #define	putwchar(wc)	fputwc(wc, __stdoutp)
 
 #if __ISO_C_VISIBLE >= 1999