diff --git a/ta_lib/core/src/ops.rs b/ta_lib/core/src/ops.rs
index 1692ac97..4f20b09f 100644
--- a/ta_lib/core/src/ops.rs
+++ b/ta_lib/core/src/ops.rs
@@ -79,7 +79,7 @@ impl Series<f64> {
     }
 
     pub fn neg(&self) -> Series<f64> {
-        self.fmap(|val| val.map(|v| if *v == 0.0 { *v } else { -*v }))
+        self.fmap(|val| val.map(|v| v.neg()))
     }
 }
 
diff --git a/ta_lib/core/src/series.rs b/ta_lib/core/src/series.rs
index 284e1880..60156745 100644
--- a/ta_lib/core/src/series.rs
+++ b/ta_lib/core/src/series.rs
@@ -106,11 +106,9 @@ impl Series<f64> {
     }
 
     pub fn nz(&self, replacement: Option<f64>) -> Self {
-        let replacement = replacement.unwrap_or(0.0);
-
         self.fmap(|opt| match opt {
             Some(v) => Some(*v),
-            None => Some(replacement),
+            None => Some(replacement.unwrap_or(0.0)),
         })
     }