diff --git a/src/calc.rs b/src/calc.rs
index 510e91d..9376c20 100644
--- a/src/calc.rs
+++ b/src/calc.rs
@@ -50,15 +50,14 @@ impl From<Infallible> for StackCalcError {
 }
 
 impl<const SS: usize, const DS: usize, E: PrimInt + Unsigned> StackCalc<SS, DS, E> {
-    pub fn push<V>(&mut self, val: V) -> Result<(), StackCalcError>
-    where
-        V: TryInto<Decimal<DS, E>>,
-        StackCalcError: From<<V as TryInto<Decimal<DS, E>>>::Error>,
-    {
+    pub fn push(
+        &mut self,
+        val: impl TryInto<Decimal<DS, E>, Error: Into<StackCalcError>>,
+    ) -> Result<(), StackCalcError> {
         if self.index == SS {
             return Err(StackCalcError::StackOverflow);
         }
-        self.stack[self.index] = val.try_into()?;
+        self.stack[self.index] = val.try_into().map_err(Into::into)?;
         self.index += 1;
         Ok(())
     }