diff --git a/nalgebra-sparse/src/coo.rs b/nalgebra-sparse/src/coo.rs
index 9793fa1e..240e2c57 100644
--- a/nalgebra-sparse/src/coo.rs
+++ b/nalgebra-sparse/src/coo.rs
@@ -212,7 +212,7 @@ impl<T> CooMatrix<T> {
     }
 
     /// Clear all triplets from the matrix.
-    pub fn clear_triplets(&mut self, i: usize, j: usize, v: T) -> Option<T>
+    pub fn clear_triplets(&mut self, i: usize, j: usize, v: T)
     where
         T: PartialEq,
     {