diff --git a/src/arithmetic/bigint.rs b/src/arithmetic/bigint.rs
index b326c35e74..9c72524970 100644
--- a/src/arithmetic/bigint.rs
+++ b/src/arithmetic/bigint.rs
@@ -83,7 +83,7 @@ impl<M, E> Clone for Elem<M, E> {
 impl<M, E> Elem<M, E> {
     #[inline]
     pub fn is_zero(&self) -> bool {
-        self.limbs.is_zero()
+        limb::limbs_are_zero_constant_time(&self.limbs) == LimbMask::True
     }
 }
 
diff --git a/src/arithmetic/bigint/boxed_limbs.rs b/src/arithmetic/bigint/boxed_limbs.rs
index 5064d3e1f4..361d8689d7 100644
--- a/src/arithmetic/bigint/boxed_limbs.rs
+++ b/src/arithmetic/bigint/boxed_limbs.rs
@@ -94,11 +94,6 @@ impl<M> BoxedLimbs<M> {
         Ok(r)
     }
 
-    #[inline]
-    pub(super) fn is_zero(&self) -> bool {
-        limb::limbs_are_zero_constant_time(&self.limbs) == LimbMask::True
-    }
-
     pub(super) fn zero(len: usize) -> Self {
         Self {
             limbs: vec![0; len].into_boxed_slice(),