diff --git a/contrib/libcxxrt/libelftc_dem_gnu3.c b/contrib/libcxxrt/libelftc_dem_gnu3.c
index 70ef3e8e1da8..2b38c73af55f 100644
--- a/contrib/libcxxrt/libelftc_dem_gnu3.c
+++ b/contrib/libcxxrt/libelftc_dem_gnu3.c
@@ -2842,7 +2842,7 @@ again:
 
 	case 'w':
 		/* wchar_t */
-		if (!cpp_demangle_push_str(ddata, "wchar_t", 6))
+		if (!cpp_demangle_push_str(ddata, "wchar_t", 7))
 			goto clean;
 		++ddata->cur;
 		goto rtn;