diff --git a/stdlib/math.affine b/stdlib/math.affine
index 24270f0c..d3b65c55 100644
--- a/stdlib/math.affine
+++ b/stdlib/math.affine
@@ -351,18 +351,18 @@ fn mean(values: [Float]) -> Float {
   if n == 0 {
     return 0.0;
   }
-  let total = 0.0;
+  let mut tot = 0.0;
   for v in values {
-    total = total + v;
+    tot = tot + v;
   }
-  total / to_float(n)
+  tot / to_float(n)
 }
 
 /// Sum of a list of floats
 fn sum_float(values: [Float]) -> Float {
-  let total = 0.0;
+  let mut tot = 0.0;
   for v in values {
-    total = total + v;
+    tot = tot + v;
   }
-  total
+  tot
 }
diff --git a/stdlib/testing.affine b/stdlib/testing.affine
index daecd88f..14b00759 100644
--- a/stdlib/testing.affine
+++ b/stdlib/testing.affine
@@ -299,11 +299,11 @@ fn bench(f: () -> (), iterations: Int) -> BenchResult {
     i = i + 1;
   }
 
-  let total = time_now() - start;
+  let tot = time_now() - start;
   {
     iterations: iterations,
-    total_time: total,
-    avg_time: total / (iterations + 0.0)
+    total_time: tot,
+    avg_time: tot / (iterations + 0.0)
   }
 }