diff --git a/src/expression_string.cpp b/src/expression_string.cpp
index aa28d3f01..590421b28 100644
--- a/src/expression_string.cpp
+++ b/src/expression_string.cpp
@@ -24,7 +24,7 @@
 
 #include <mapnik/expression_string.hpp>
 #include <boost/variant.hpp>
-#include <unicode/uvernum.h>
+#include <unicode/uversion.h>