diff --git a/libc/bionic/c32rtomb.cpp b/libc/bionic/c32rtomb.cpp
index 2909d8b..d2519b9 100644
--- a/libc/bionic/c32rtomb.cpp
+++ b/libc/bionic/c32rtomb.cpp
@@ -50,7 +50,7 @@
     return mbstate_reset_and_return(1, state);
   }
 
-  if (!mbsinit(state)) {
+  if (!mbstate_is_initial(state)) {
     return mbstate_reset_and_return_illegal(EILSEQ, state);
   }