diff --git a/crash_reporter/user_collector.cc b/crash_reporter/user_collector.cc
index ac2f90e..069b581 100644
--- a/crash_reporter/user_collector.cc
+++ b/crash_reporter/user_collector.cc
@@ -4,13 +4,13 @@
 
 #include "user_collector.h"
 
-#include <bits/wordsize.h>
 #include <elf.h>
 #include <fcntl.h>
 #include <grp.h>  // For struct group.
 #include <pcrecpp.h>
 #include <pwd.h>  // For struct passwd.
 #include <stdint.h>
+#include <sys/cdefs.h>  // For __WORDSIZE
 #include <sys/types.h>  // For getpwuid_r, getgrnam_r, WEXITSTATUS.
 
 #include <string>
diff --git a/crash_reporter/user_collector_test.cc b/crash_reporter/user_collector_test.cc
index a0ada06..ee3ca12 100644
--- a/crash_reporter/user_collector_test.cc
+++ b/crash_reporter/user_collector_test.cc
@@ -4,8 +4,8 @@
 
 #include "user_collector.h"
 
-#include <bits/wordsize.h>
 #include <elf.h>
+#include <sys/cdefs.h>  // For __WORDSIZE
 #include <unistd.h>
 
 #include <base/files/file_util.h>
diff --git a/crash_reporter/warn_collector.l b/crash_reporter/warn_collector.l
index 691ef99..de746fe 100644
--- a/crash_reporter/warn_collector.l
+++ b/crash_reporter/warn_collector.l
@@ -11,6 +11,8 @@
  * shipment to the crash server.
  */
 
+%option noyywrap
+
 %{
 #include <fcntl.h>
 #include <inttypes.h>
@@ -122,6 +124,7 @@
   hash_bitmap[word_index] |= 1 << bit_index;
 }
 
+#pragma GCC diagnostic ignored "-Wwrite-strings"
 int WarnStart(void) {
   uint32_t hash;
   char *spacep;
@@ -140,7 +143,7 @@
   yyout = fopen(warn_dump_path, "w");
   if (yyout == NULL)
     Die("fopen %s failed: %s\n", warn_dump_path, strerror(errno));
-  spacep = index(yytext, ' ');
+  spacep = strchr(yytext, ' ');
   if (spacep == NULL || spacep[1] == '\0')
     spacep = "unknown-function";
   fprintf(yyout, "%08x-%s\n", hash, spacep + 1);
@@ -318,5 +321,4 @@
  */
 void UnusedFunctionWarningSuppressor(void) {
   yyunput(0, 0);
-  (void) input();
 }