diff --git a/lib/std/time/clock.c3 b/lib/std/time/clock.c3
index 91436eeba..c5d70ccee 100644
--- a/lib/std/time/clock.c3
+++ b/lib/std/time/clock.c3
@@ -1,11 +1,12 @@
 module std::time::clock;
+import std::time::os;
 
 fn Clock now()
 {
-	$if $defined(native_clock):
+	$if $defined(os::native_clock):
 		return os::native_clock();
 	$else
-		return 0;
+		unreachable("Clock unsupported");
 	$endif
 }
 
diff --git a/lib/std/time/time.c3 b/lib/std/time/time.c3
index 7b7cd070a..c58273ad6 100644
--- a/lib/std/time/time.c3
+++ b/lib/std/time/time.c3
@@ -1,5 +1,5 @@
 module std::time;
-import std::io;
+import std::io, std::time::os;
 
 distinct Time = long;
 distinct Duration = long;