diff --git a/tools/generate_strings/main.cc b/tools/generate_strings/main.cc
index 619d88a2..e79f3b24 100644
--- a/tools/generate_strings/main.cc
+++ b/tools/generate_strings/main.cc
@@ -8,6 +8,7 @@
 
 #include <fstream>
 #include <regex>
+#include <sstream>
 #include <unistd.h>