diff --git a/CMakeLists.txt b/CMakeLists.txt
index b5b6ffca9..9ce2fb9d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -231,12 +231,12 @@ endif()
 
 if(USE_PROJ)
     #https://proj.org/development/cmake.html
-    mapnik_find_package(PROJ4 REQUIRED)
-    math(EXPR MAPNIK_PROJ_VERSION "${PROJ4_VERSION_MAJOR}*10000 + ${PROJ4_VERSION_MINOR}*100 + ${PROJ4_VERSION_PATCH}" OUTPUT_FORMAT DECIMAL)
+    mapnik_find_package(PROJ REQUIRED)
+    math(EXPR MAPNIK_PROJ_VERSION "${PROJ_VERSION_MAJOR}*10000 + ${PROJ_VERSION_MINOR}*100 + ${PROJ_VERSION_PATCH}" OUTPUT_FORMAT DECIMAL)
     message(STATUS "Using mapnik PROJ version: ${MAPNIK_PROJ_VERSION}")
     list(APPEND MAPNIK_COMPILE_DEFS MAPNIK_USE_PROJ MAPNIK_PROJ_VERSION=${MAPNIK_PROJ_VERSION})
-    list(APPEND MAPNIK_OPTIONAL_LIBS ${PROJ4_LIBRARIES})
-    list(APPEND MAPNIK_OPTIONAL_LIBS_INCLUDE ${PROJ4_INCLUDE_DIRS})
+    list(APPEND MAPNIK_OPTIONAL_LIBS ${PROJ_LIBRARIES})
+    list(APPEND MAPNIK_OPTIONAL_LIBS_INCLUDE ${PROJ_INCLUDE_DIRS})
 endif()
 
 if(USE_GRID_RENDERER)