diff --git a/vlib/builtin/builtin_nix.v b/vlib/builtin/builtin_nix.v
index dd09c9352c..0555f7cbe4 100644
--- a/vlib/builtin/builtin_nix.v
+++ b/vlib/builtin/builtin_nix.v
@@ -16,7 +16,7 @@ fn print_backtrace_skipping_top_frames_mingw(skipframes int) bool {
 
 fn print_backtrace_skipping_top_frames_nix(xskipframes int) bool {
 	skipframes := xskipframes + 2
-	$if mac { return print_backtrace_skipping_top_frames_mac(skipframes) }
+	$if macos { return print_backtrace_skipping_top_frames_mac(skipframes) }
 	$if linux { return print_backtrace_skipping_top_frames_linux(skipframes) }
 	$if freebsd { return print_backtrace_skipping_top_frames_freebsd(skipframes)  }
 	return false
@@ -25,7 +25,7 @@ fn print_backtrace_skipping_top_frames_nix(xskipframes int) bool {
 // the functions below are not called outside this file,
 // so there is no need to have their twins in builtin_windows.v
 fn print_backtrace_skipping_top_frames_mac(skipframes int) bool {
-	$if mac {
+	$if macos {
 	buffer := [100]byteptr
 	nr_ptrs := C.backtrace(*voidptr(buffer), 100)
 	C.backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_ptrs-skipframes, 1)
diff --git a/vlib/compiler/cc.v b/vlib/compiler/cc.v
index 3d352df9fa..9bea052c67 100644
--- a/vlib/compiler/cc.v
+++ b/vlib/compiler/cc.v
@@ -396,7 +396,7 @@ start:
 		ret2 := os.system('upx --lzma -qqq $v.out_name')
 		if ret2 != 0 {
 			println('upx failed')
-			$if mac {
+			$if macos {
 				println('install upx with `brew install upx`')
 			}
 			$if linux {
@@ -539,7 +539,7 @@ fn missing_compiler_info() string {
 	$if linux {
 		return 'On Debian/Ubuntu, run `sudo apt install build-essential`'
 	}
-	$if mac {
+	$if macos {
 		return 'Install command line XCode tools with `xcode-select --install`'
 	}
 	return ''
diff --git a/vlib/compiler/main.v b/vlib/compiler/main.v
index f9dad0736b..8a03a6dfdc 100644
--- a/vlib/compiler/main.v
+++ b/vlib/compiler/main.v
@@ -945,7 +945,7 @@ pub fn new_v(args[]string) &V {
 		$if linux {
 			_os = .linux
 		}
-		$if mac {
+		$if macos {
 			_os = .mac
 		}
 		$if windows {
diff --git a/vlib/os/os.v b/vlib/os/os.v
index d136330480..b4850798e5 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -673,7 +673,7 @@ pub fn user_os() string {
 	$if linux {
 		return 'linux'
 	}
-	$if mac {
+	$if macos {
 		return 'mac'
 	}
 	$if windows {
@@ -742,7 +742,7 @@ fn on_segfault(f voidptr) {
 	$if windows {
 		return
 	}
-	$if mac {
+	$if macos {
 		mut sa := C.sigaction{}
 		C.memset(&sa, 0, sizeof(sigaction))
 		C.sigemptyset(&sa.sa_mask)
@@ -775,7 +775,7 @@ pub fn executable() string {
 		len := int(C.GetModuleFileName( 0, result, max ))
 		return string_from_wide2(result, len)
 	}
-	$if mac {
+	$if macos {
 		mut result := calloc(MAX_PATH)
 		pid := C.getpid()
 		ret := proc_pidpath (pid, result, MAX_PATH)
@@ -1013,7 +1013,7 @@ pub fn tmpdir() string {
 	$if linux {
 		if path == '' { path = '/tmp' }
 	}
-	$if mac {
+	$if macos {
 		/*
 		if path == '' {
 			// TODO untested