diff --git a/libc/bionic/ctype.cpp b/libc/bionic/ctype.cpp
index 3960d9d..2b31d52 100644
--- a/libc/bionic/ctype.cpp
+++ b/libc/bionic/ctype.cpp
@@ -36,10 +36,6 @@
   return isalpha(c);
 }
 
-int isascii_l(int c, locale_t) {
-  return isascii(c);
-}
-
 int isblank_l(int c, locale_t) {
   return isblank(c);
 }
diff --git a/libc/include/ctype.h b/libc/include/ctype.h
index 19b1adf..d05a952 100644
--- a/libc/include/ctype.h
+++ b/libc/include/ctype.h
@@ -75,7 +75,6 @@
 
 int isalnum_l(int, locale_t);
 int isalpha_l(int, locale_t);
-int isascii_l(int, locale_t);
 int isblank_l(int, locale_t);
 int iscntrl_l(int, locale_t);
 int isdigit_l(int, locale_t);