diff --git a/src/multiexp.rs b/src/multiexp.rs
index ec42d67a2..8d70200d7 100644
--- a/src/multiexp.rs
+++ b/src/multiexp.rs
@@ -280,7 +280,7 @@ where
     // Split the exponents into chunks.
     let exponents = Arc::new(
         exponents
-            .iter()
+            .par_iter()
             .map(|exp| exp.chunks(c as usize))
             .collect::<Vec<_>>(),
     );