diff --git a/CMake/FindPythonModule.cmake b/CMake/FindPythonModule.cmake
index 90e247d97c..782548c981 100644
--- a/CMake/FindPythonModule.cmake
+++ b/CMake/FindPythonModule.cmake
@@ -21,7 +21,7 @@ function(find_python_module module)
     endif ()
   endif ()
   find_package_handle_standard_args(PY_${module} DEFAULT_MSG PY_${module_upper})
-  if (NOT PY_${module}_FOUND AND ${module}_FIND_REQUIRED)
+  if (NOT PY_${module_upper}_FOUND AND ${module_upper}_FIND_REQUIRED)
     message(FATAL_ERROR "Could not find Python module ${module}!")
   endif ()
 endfunction ()