diff --git a/CMakeLists.txt b/CMakeLists.txt
index aea5a28..6c5c8b1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -165,8 +165,10 @@ if(CMAKE_CROSSCOMPILING)
   # Put Prusa Magic™ at the beginning of the hex
   add_custom_command(
     TARGET firmware POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -D WORK_DIR=${CMAKE_BINARY_DIR} -P
-            ${CMAKE_SOURCE_DIR}/cmake/HexConcat.cmake
+    COMMAND
+      ${CMAKE_COMMAND} -D WORK_DIR=${CMAKE_BINARY_DIR} -D
+      HEX_NAME="MMU2SR_${PROJECT_VERSION}${PROJECT_VERSION_SUFFIX_SHORT}.hex" -P
+      ${CMAKE_SOURCE_DIR}/cmake/HexConcat.cmake
     DEPENDS firmware.hex
     )
 
diff --git a/cmake/HexConcat.cmake b/cmake/HexConcat.cmake
index ec5f048..cc2b1cc 100644
--- a/cmake/HexConcat.cmake
+++ b/cmake/HexConcat.cmake
@@ -1,7 +1,6 @@
-cmake_minimum_required(VERSION 3.15)
+cmake_minimum_required(VERSION 2.8)
 set(HEX_PREFIX "\; device = mm-control\n\n")
-set(HEX_NAME "MMU2SR_${PROJECT_VERSION}${PROJECT_VERSION_SUFFIX_SHORT}.hex")
 file(READ ${WORK_DIR}/firmware.hex HEX)
 file(WRITE ${WORK_DIR}/${HEX_NAME} ${HEX_PREFIX})
 file(APPEND ${WORK_DIR}/${HEX_NAME} ${HEX})
-message(status "Successfully built MMU2SR_${PROJECT_VERSION}${PROJECT_VERSION_SUFFIX_SHORT}.hex!")
+message(status "Successfully built ${HEX_NAME}!")