diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7f779db10..4c705cec8 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -753,12 +753,12 @@ else()
 		set(OTHER_FLAGS "${OTHER_FLAGS} -mthreads -fexceptions")
 	endif()
 
-	set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG ${RELEASE_WARNING_FLAGS} ${WARNING_FLAGS} ${OTHER_FLAGS} -ffast-math -Wall -pipe -funroll-loops")
-	if(APPLE)
+	set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG ${RELEASE_WARNING_FLAGS} ${WARNING_FLAGS} ${OTHER_FLAGS} -Wall -pipe -funroll-loops")
+	if(CMAKE_SYSTEM_NAME MATCHES "(Darwin|FreeBSD)")
 		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Os")
 	else()
-		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -fomit-frame-pointer")
-	endif(APPLE)
+		set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -ffast-math -fomit-frame-pointer")
+	endif(CMAKE_SYSTEM_NAME MATCHES "(Darwin|FreeBSD)")
 	set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")
 	set(CMAKE_CXX_FLAGS_DEBUG "-g -O0 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")