diff --git a/src/Wt/Render/WTextRenderer.C b/src/Wt/Render/WTextRenderer.C
index 98f5085..ae5ac67 100644
--- a/src/Wt/Render/WTextRenderer.C
+++ b/src/Wt/Render/WTextRenderer.C
@@ -15,6 +15,7 @@
 
 #include <fstream>
 #include <string>
+#include <limits>
 
 namespace {
   const double EPSILON = 1e-4;