diff --git a/src/openalpr/support/utf8.cpp b/src/openalpr/support/utf8.cpp
index 6131f17..63c511a 100644
--- a/src/openalpr/support/utf8.cpp
+++ b/src/openalpr/support/utf8.cpp
@@ -1,5 +1,5 @@
 #include "utf8.h"
-
+#include <string>
 
 std::string utf8chr(int cp)
 {