diff --git a/src/backend/serial/scalar_mul/precomputed_straus.rs b/src/backend/serial/scalar_mul/precomputed_straus.rs
index 4019b14..9c66c9a 100644
--- a/src/backend/serial/scalar_mul/precomputed_straus.rs
+++ b/src/backend/serial/scalar_mul/precomputed_straus.rs
@@ -85,7 +85,7 @@ impl VartimePrecomputedMultiscalarMul for VartimePrecomputedStraus {
         // nonzero NAF coefficient, but since we might have a lot of
         // them to search, it's not clear it's worthwhile to check.
         let mut S = ProjectivePoint::identity();
-        for j in (0..255).rev() {
+        for j in (0..256).rev() {
             let mut R: CompletedPoint = S.double();
 
             for i in 0..dp {
diff --git a/src/backend/serial/scalar_mul/straus.rs b/src/backend/serial/scalar_mul/straus.rs
index 4053ea3..862cf25 100644
--- a/src/backend/serial/scalar_mul/straus.rs
+++ b/src/backend/serial/scalar_mul/straus.rs
@@ -179,7 +179,7 @@ impl VartimeMultiscalarMul for Straus {
 
         let mut r = ProjectivePoint::identity();
 
-        for i in (0..255).rev() {
+        for i in (0..256).rev() {
             let mut t: CompletedPoint = r.double();
 
             for (naf, lookup_table) in nafs.iter().zip(lookup_tables.iter()) {
diff --git a/src/backend/serial/scalar_mul/vartime_double_base.rs b/src/backend/serial/scalar_mul/vartime_double_base.rs
index d95151f..42f6bd7 100644
--- a/src/backend/serial/scalar_mul/vartime_double_base.rs
+++ b/src/backend/serial/scalar_mul/vartime_double_base.rs
@@ -23,7 +23,7 @@ pub fn mul(a: &Scalar, A: &EdwardsPoint, b: &Scalar) -> EdwardsPoint {
 
     // Find starting index
     let mut i: usize = 255;
-    for j in (0..255).rev() {
+    for j in (0..256).rev() {
         i = j;
         if a_naf[i] != 0 || b_naf[i] != 0 {
             break;
diff --git a/src/backend/vector/scalar_mul/precomputed_straus.rs b/src/backend/vector/scalar_mul/precomputed_straus.rs
index 49d1be4..cc1404a 100644
--- a/src/backend/vector/scalar_mul/precomputed_straus.rs
+++ b/src/backend/vector/scalar_mul/precomputed_straus.rs
@@ -84,7 +84,7 @@ impl VartimePrecomputedMultiscalarMul for VartimePrecomputedStraus {
         // nonzero NAF coefficient, but since we might have a lot of
         // them to search, it's not clear it's worthwhile to check.
         let mut R = ExtendedPoint::identity();
-        for j in (0..255).rev() {
+        for j in (0..256).rev() {
             R = R.double();
 
             for i in 0..dp {
diff --git a/src/backend/vector/scalar_mul/straus.rs b/src/backend/vector/scalar_mul/straus.rs
index 506693d..285a5fd 100644
--- a/src/backend/vector/scalar_mul/straus.rs
+++ b/src/backend/vector/scalar_mul/straus.rs
@@ -94,7 +94,7 @@ impl VartimeMultiscalarMul for Straus {
 
         let mut Q = ExtendedPoint::identity();
 
-        for i in (0..255).rev() {
+        for i in (0..256).rev() {
             Q = Q.double();
 
             for (naf, lookup_table) in nafs.iter().zip(lookup_tables.iter()) {
diff --git a/src/backend/vector/scalar_mul/vartime_double_base.rs b/src/backend/vector/scalar_mul/vartime_double_base.rs
index 44d92f7..ff641cc 100644
--- a/src/backend/vector/scalar_mul/vartime_double_base.rs
+++ b/src/backend/vector/scalar_mul/vartime_double_base.rs
@@ -23,7 +23,7 @@ pub fn mul(a: &Scalar, A: &EdwardsPoint, b: &Scalar) -> EdwardsPoint {
 
     // Find starting index
     let mut i: usize = 255;
-    for j in (0..255).rev() {
+    for j in (0..256).rev() {
         i = j;
         if a_naf[i] != 0 || b_naf[i] != 0 {
             break;