diff --git a/CMakeLists.txt b/CMakeLists.txt
index 10c33b1e1..feb4acb32 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -66,7 +66,7 @@ elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
   target_sources(btop PRIVATE src/freebsd/btop_collect.cpp)
 elseif(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
   target_sources(btop PRIVATE src/openbsd/btop_collect.cpp src/openbsd/sysctlbyname.cpp)
-elseif(LINUX)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
   target_sources(btop PRIVATE src/linux/btop_collect.cpp)
 else()
   message(FATAL_ERROR "${CMAKE_SYSTEM_NAME} is not supported")