diff --git a/include/mapnik/projection.hpp b/include/mapnik/projection.hpp
index 4d7be1708..ffca994d3 100644
--- a/include/mapnik/projection.hpp
+++ b/include/mapnik/projection.hpp
@@ -39,7 +39,7 @@ MAPNIK_DISABLE_WARNING_POP
 
 
 // fwd decl
-#if PROJ_VERSION_MAJOR >= 8
+#if PROJ_VERSION >= 80000
 struct pj_ctx;
 using PJ_CONTEXT = struct pj_ctx;
 #else