diff --git a/src/processor/logging.cc b/src/processor/logging.cc
index c1eebbc2..d59175a7 100644
--- a/src/processor/logging.cc
+++ b/src/processor/logging.cc
@@ -69,6 +69,9 @@ LogStream::LogStream(std::ostream &stream, Severity severity,
     case SEVERITY_ERROR:
       severity_string = "ERROR";
       break;
+    case SEVERITY_CRITICAL:
+      severity_string = "CRITICAL";
+      break;
   }
 
   stream_ << time_string << ": " << PathnameStripper::File(file) << ":" <<
diff --git a/src/processor/logging.h b/src/processor/logging.h
index 406fb67c..97c2fe31 100644
--- a/src/processor/logging.h
+++ b/src/processor/logging.h
@@ -94,7 +94,8 @@ class LogStream {
  public:
   enum Severity {
     SEVERITY_INFO,
-    SEVERITY_ERROR
+    SEVERITY_ERROR,
+    SEVERITY_CRITICAL
   };
 
   // Begin logging a message to the stream identified by |stream|, at the
@@ -180,6 +181,15 @@ int ErrnoString(string *error_string);
                         __FILE__, __LINE__)
 #endif  // BPLOG_ERROR
 
+#ifndef BPLOG_CRITICAL
+#ifndef BPLOG_CRITICAL_STREAM
+#define BPLOG_CRITICAL_STREAM std::cerr
+#endif  // BPLOG_CRITICAL_STREAM
+#define BPLOG_CRITICAL google_breakpad::LogStream(BPLOG_CRITICAL_STREAM, \
+                        google_breakpad::LogStream::SEVERITY_CRITICAL, \
+                        __FILE__, __LINE__)
+#endif  // BPLOG_CRITICAL
+
 #define BPLOG_IF(severity, condition) \
     BPLOG_LAZY_STREAM(severity, ((condition) && BPLOG_LOG_IS_ON(severity)))