diff --git a/libc/bionic/wchar.cpp b/libc/bionic/wchar.cpp
index 8d56458..8367817 100644
--- a/libc/bionic/wchar.cpp
+++ b/libc/bionic/wchar.cpp
@@ -97,6 +97,7 @@
 
 int iswalnum(wint_t wc) { return isalnum(wc); }
 int iswalpha(wint_t wc) { return isalpha(wc); }
+int iswblank(wint_t wc) { return isblank(wc); }
 int iswcntrl(wint_t wc) { return iscntrl(wc); }
 int iswdigit(wint_t wc) { return isdigit(wc); }
 int iswgraph(wint_t wc) { return isgraph(wc); }