diff --git a/src/base/third_party/symbolize/symbolize.h b/src/base/third_party/symbolize/symbolize.h
index 2a55c688ae..987569fdde 100644
--- a/src/base/third_party/symbolize/symbolize.h
+++ b/src/base/third_party/symbolize/symbolize.h
@@ -54,6 +54,8 @@
 #ifndef BASE_SYMBOLIZE_H_
 #define BASE_SYMBOLIZE_H_
 
+#include <sys/types.h>  // for ssize_t
+
 #include "utilities.h"
 #include "config.h"
 #include "glog/logging.h"