diff --git a/src/span.rs b/src/span.rs
index 3421c35f0a..2324b5b8b5 100644
--- a/src/span.rs
+++ b/src/span.rs
@@ -54,7 +54,7 @@ impl Span {
 
     /// Check wether `self` was defined or is a default/unknown span
     fn is_defined(&self) -> bool {
-        *self == Self::default()
+        *self != Self::default()
     }
 }