diff --git a/crash_reporter/crash_collector.cc b/crash_reporter/crash_collector.cc
index d993576..6e81c51 100644
--- a/crash_reporter/crash_collector.cc
+++ b/crash_reporter/crash_collector.cc
@@ -317,7 +317,7 @@
       continue;
 
     std::string filename(ent->d_name);
-    size_t last_dot = filename.rfind(".");
+    size_t last_dot = filename.rfind('.');
     std::string basename;
     // If there is a valid looking extension, use the base part of the
     // name.  If the only dot is the first byte (aka a dot file), treat
diff --git a/crash_reporter/kernel_collector_test.cc b/crash_reporter/kernel_collector_test.cc
index 60fd832..0f6b930 100644
--- a/crash_reporter/kernel_collector_test.cc
+++ b/crash_reporter/kernel_collector_test.cc
@@ -283,7 +283,7 @@
   pos += strlen(kNamePrefix);
   std::string filename = log.substr(pos, std::string::npos);
   // Take the name up until \n
-  size_t end_pos = filename.find_first_of("\n");
+  size_t end_pos = filename.find_first_of('\n');
   ASSERT_NE(std::string::npos, end_pos);
   filename = filename.substr(0, end_pos);
   ASSERT_EQ(0U, filename.find(test_crash_directory().value()));