diff --git a/include/wchar.h b/include/wchar.h
index 89867ac746c..f0fdb2cb7ae 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -163,7 +163,7 @@ __END_DECLS
 
 #define	getwc(fp)	fgetwc(fp)
 #define getwchar()	fgetwc(stdin)
-#define putwc(wc, fp)	fputwc(wc, fp)
-#define putwchar(wc)	fputwc(wc, stdout)
+#define putwc(wc, fp)	fputwc((wc), (fp))
+#define putwchar(wc)	fputwc((wc), stdout)
 
 #endif /* !_WCHAR_H_ */