diff --git a/CMakeLists.txt b/CMakeLists.txt
index f221d342..ac3663fc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -627,7 +627,8 @@ else()
   include(GNUInstallDirs)
 endif()
 
-string(REPLACE ";" "-" ISLE_CPUS_STRING "${ISLE_CPU}")
+string(REPLACE ";" "-" ISLE_CPUS_STRING "${ISLE_CPUS}")
+string(TOLOWER "${ISLE_CPUS_STRING}" ISLE_CPUS_STRING)
 set(ISLE_PACKAGE_NAME "${CMAKE_SYSTEM_NAME}-${ISLE_CPUS_STRING}" CACHE STRING "Platform name of the package")
 if(BUILD_SHARED_LIBS)
   list(APPEND install_extra_targets lego1)