diff --git a/cmake/Modules/Packages/KIM.cmake b/cmake/Modules/Packages/KIM.cmake
index 5482d3071c..2a2a1cde78 100644
--- a/cmake/Modules/Packages/KIM.cmake
+++ b/cmake/Modules/Packages/KIM.cmake
@@ -35,9 +35,13 @@ if(DOWNLOAD_KIM)
   include(ExternalProject)
   enable_language(C)
   enable_language(Fortran)
+  set(KIM_URL "https://s3.openkim.org/kim-api/kim-api-2.2.1.txz" CACHE STRING "URL for KIM tarball")
+  set(KIM_MD5 "ae1ddda2ef7017ea07934e519d023dca" CACHE STRING "MD5 checksum of KIM tarball")
+  mark_as_advanced(KIM_URL)
+  mark_as_advanced(KIM_MD5)
   ExternalProject_Add(kim_build
-    URL https://s3.openkim.org/kim-api/kim-api-2.2.1.txz
-    URL_MD5 ae1ddda2ef7017ea07934e519d023dca
+    URL     ${KIM_URL}
+    URL_MD5 ${KIM_MD5}
     BINARY_DIR build
     CMAKE_ARGS ${CMAKE_REQUEST_PIC}
                -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}