diff --git a/libc/bionic/ndk_cruft.cpp b/libc/bionic/ndk_cruft.cpp
index 1ae388b..e3e640a 100644
--- a/libc/bionic/ndk_cruft.cpp
+++ b/libc/bionic/ndk_cruft.cpp
@@ -36,6 +36,7 @@
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/resource.h>
 #include <sys/syscall.h>
 #include <sys/time.h>
@@ -296,4 +297,9 @@
   return 0;
 }
 
+// This was removed from POSIX 2008.
+extern "C" char* index(const char* str, int ch) {
+  return strchr(str, ch);
+}
+
 #endif