diff --git a/CMakeLists.txt b/CMakeLists.txt
index 982fad89d5..77ecddeb96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3638,7 +3638,8 @@ endforeach()
 if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/REVISION.txt")
   file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/REVISION.txt" revisions)
   list(GET revisions 0 revisions_0)
-  string(STRIP "${revisions_0}" SDL_REVISION)
+  string(STRIP "${revisions_0}" revisions_0_stripped)
+  set(SDL_REVISION "SDL-${revisions_0_stripped}")
 else()
   set(SDL_REVISION "" CACHE STRING "Custom SDL revision (only used when REVISION.txt does not exist)")
 endif()