diff --git a/Makefile.toml b/Makefile.toml
index 23d8b2a3..bcf776da 100644
--- a/Makefile.toml
+++ b/Makefile.toml
@@ -2,7 +2,7 @@
 default_to_workspace = false
 
 [env]
-FUZZ_RUNS = 10000000
+FUZZ_RUNS = 1000
 
 [tasks.build]
 command = "cargo"
diff --git a/fuzz/fuzz_targets/arithmetic.rs b/fuzz/fuzz_targets/arithmetic.rs
index 061f008d..647b38b8 100644
--- a/fuzz/fuzz_targets/arithmetic.rs
+++ b/fuzz/fuzz_targets/arithmetic.rs
@@ -1,6 +1,6 @@
 #![no_main]
 
-use rust_decimal::Decimal;
+use rust_decimal::{Decimal, MathematicalOps};
 
 #[derive(Debug, arbitrary::Arbitrary)]
 struct Data {
@@ -14,13 +14,13 @@ struct Data {
 libfuzzer_sys::fuzz_target!(|data: Data| {
     let _ = data.a.checked_add(data.b);
     let _ = data.a.checked_div(data.b);
-    //let _ = data.a.checked_exp_with_tolerance(data.b);
-    //let _ = data.a.checked_exp();
-    //let _ = data.a.checked_mul(data.b);
-    //let _ = data.a.checked_norm_pdf();
-    //let _ = data.a.checked_powd(data.b);
-    //let _ = data.a.checked_powf(data.exp_f64);
-    //let _ = data.a.checked_powi(data.exp_i64);
-    //let _ = data.a.checked_powu(data.exp_u64);
-    //let _ = data.a.checked_sub(data.b);
+    let _ = data.a.checked_exp_with_tolerance(data.b);
+    let _ = data.a.checked_exp();
+    let _ = data.a.checked_mul(data.b);
+    let _ = data.a.checked_norm_pdf();
+    let _ = data.a.checked_powd(data.b);
+    let _ = data.a.checked_powf(data.exp_f64);
+    let _ = data.a.checked_powi(data.exp_i64);
+    let _ = data.a.checked_powu(data.exp_u64);
+    let _ = data.a.checked_sub(data.b);
 });
diff --git a/src/maths.rs b/src/maths.rs
index e6a79b0e..22300891 100644
--- a/src/maths.rs
+++ b/src/maths.rs
@@ -155,7 +155,7 @@ impl MathematicalOps for Decimal {
         }
 
         let mut term = *self;
-        let mut result = self + Decimal::ONE;
+        let mut result = self.checked_add(Decimal::ONE)?;
 
         for factorial in FACTORIAL.iter().skip(2) {
             term = self.checked_mul(term)?;