diff --git a/src/wasm.rs b/src/wasm.rs
index 57ee1e6..43c487b 100644
--- a/src/wasm.rs
+++ b/src/wasm.rs
@@ -147,7 +147,7 @@ impl SystemTime {
     }
 
     pub fn elapsed(&self) -> Result<Duration, ()> {
-        self.duration_since(SystemTime::now())
+        SystemTime::now().duration_since(*self)
     }
 
     pub fn checked_add(&self, duration: Duration) -> Option<SystemTime> {