diff --git a/src/projection.cpp b/src/projection.cpp
index 8a28fd4e4..bfe13ad89 100644
--- a/src/projection.cpp
+++ b/src/projection.cpp
@@ -31,6 +31,7 @@
 #ifdef MAPNIK_USE_PROJ
 // proj
 #include <proj.h>
+#include <cmath> // HUGE_VAL
 #endif
 
 namespace mapnik {