diff --git a/FindProj.cmake b/FindProj.cmake
index d0ad629..4cb570f 100644
--- a/FindProj.cmake
+++ b/FindProj.cmake
@@ -31,6 +31,14 @@ if(PROJ_FOUND)
     MESSAGE(STATUS "Found Proj: ${PROJ_LIBRARIES}")
   endif()
   set(HAVE_PROJ 1)
+  if(EXISTS ${PROJ_INCLUDE_DIR}/proj.h)
+    file(READ ${PROJ_INCLUDE_DIR}/proj.h proj_version)
+    string(REGEX REPLACE "^.*PROJ_VERSION_MAJOR +([0-9]+).*$" "\\1" PROJ_VERSION_MAJOR "${proj_version}")
+  elseif(EXISTS ${PROJ_INCLUDE_DIR}/proj_api.h)
+    string(REGEX REPLACE "^.*PJ_VERSION ([0-9]+).*$" "\\1" PJ_VERSION "${proj_version}")
+    string(REGEX REPLACE "([0-9])([0-9])([0-9])" "\\1" PROJ_VERSION_MAJOR "${PJ_VERSION}")
+  endif()
+  set(PROJ_VERSION_MAJOR "${PROJ_VERSION_MAJOR}" CACHE INTERNAL "")
 elseif(PROJ_FOUND)
   if(PROJ_FIND_REQUIRED)
     message(FATAL_ERROR "Could not find Proj")