diff --git a/docs/source/CMakeLists.txt b/docs/source/CMakeLists.txt
index 6b84c94e..c783484c 100644
--- a/docs/source/CMakeLists.txt
+++ b/docs/source/CMakeLists.txt
@@ -1,6 +1,6 @@
 find_program(M2R NAMES m2r m2r-3)
 
-function(DefaultRstPath MDFILE RSTFILE_VAR)
+function(DefaultRstPath RSTFILE_VAR MDFILE)
     string(REGEX REPLACE "\\.md$" ".rst" FILEPATH ${MDFILE})
     get_filename_component(FILENAME ${FILEPATH} NAME)
     set(${RSTFILE_VAR} "${CMAKE_CURRENT_SOURCE_DIR}/${FILENAME}" PARENT_SCOPE)
@@ -33,7 +33,7 @@ if(M2R)
     message("-- Checking ChangeLogs, BUGS, etc...")
     file(GLOB CHANGELOGS "${CMAKE_SOURCE_DIR}/ChangeLog-*.md")
     foreach(CHANGELOG IN LISTS CHANGELOGS)
-        DefaultRstPath(${CHANGELOG} RESTFILE)
+        DefaultRstPath(RESTFILE ${CHANGELOG})
         UpdateRstFromMd(${RESTFILE} ${CHANGELOG})
     endforeach()
     UpdateRstFromMd(issues.rst "${CMAKE_SOURCE_DIR}/BUGS.md")