diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b9eac1e..3336fbc5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -196,8 +196,6 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake_au
 if(APPLE)
   message(STATUS "Detected macOS")
   
-  set(ARMA_OS macos)
-  
   set(ARMA_USE_LAPACK     true)
   set(ARMA_USE_BLAS       true)
   set(ARMA_USE_ACCELERATE true)
@@ -258,8 +256,6 @@ if(APPLE)
   
 else()
   
-  set(ARMA_OS unix)
-  
   include(ARMA_FindMKL)
   include(ARMA_FindACMLMP)
   include(ARMA_FindACML)