diff --git a/units/src/amount/mod.rs b/units/src/amount/mod.rs
index 21eb9ed8c..db027a191 100644
--- a/units/src/amount/mod.rs
+++ b/units/src/amount/mod.rs
@@ -527,6 +527,7 @@ pub struct Display {
 
 impl Display {
     /// Makes subsequent calls to `Display::fmt` display denomination.
+    #[must_use]
     pub fn show_denomination(mut self) -> Self {
         match &mut self.style {
             DisplayStyle::FixedDenomination { show_denomination, .. } => *show_denomination = true,
diff --git a/units/src/amount/signed.rs b/units/src/amount/signed.rs
index 4237ba0bb..1061a575a 100644
--- a/units/src/amount/signed.rs
+++ b/units/src/amount/signed.rs
@@ -206,6 +206,7 @@ impl SignedAmount {
     // Some arithmetic that doesn't fit in [`core::ops`] traits.
 
     /// Get the absolute value of this [`SignedAmount`].
+    #[must_use]
     pub fn abs(self) -> SignedAmount { SignedAmount(self.0.abs()) }
 
     /// Gets the absolute value of this [`SignedAmount`] returning [`Amount`].
@@ -307,6 +308,7 @@ impl SignedAmount {
     /// # Panics
     ///
     /// On overflow, panics in debug mode, wraps in release mode.
+    #[must_use]
     pub fn unchecked_add(self, rhs: SignedAmount) -> SignedAmount { Self(self.0 + rhs.0) }
 
     /// Unchecked subtraction.
@@ -316,6 +318,7 @@ impl SignedAmount {
     /// # Panics
     ///
     /// On overflow, panics in debug mode, wraps in release mode.
+    #[must_use]
     pub fn unchecked_sub(self, rhs: SignedAmount) -> SignedAmount { Self(self.0 - rhs.0) }
 
     /// Subtraction that doesn't allow negative [`SignedAmount`]s.
diff --git a/units/src/amount/unsigned.rs b/units/src/amount/unsigned.rs
index 9b96c4d51..af43e631b 100644
--- a/units/src/amount/unsigned.rs
+++ b/units/src/amount/unsigned.rs
@@ -318,6 +318,7 @@ impl Amount {
     /// # Panics
     ///
     /// On overflow, panics in debug mode, wraps in release mode.
+    #[must_use]
     pub fn unchecked_add(self, rhs: Amount) -> Amount { Self(self.0 + rhs.0) }
 
     /// Unchecked subtraction.
@@ -327,6 +328,7 @@ impl Amount {
     /// # Panics
     ///
     /// On overflow, panics in debug mode, wraps in release mode.
+    #[must_use]
     pub fn unchecked_sub(self, rhs: Amount) -> Amount { Self(self.0 - rhs.0) }
 
     /// Converts to a signed amount.
diff --git a/units/src/lib.rs b/units/src/lib.rs
index b9e7e960a..59bc16205 100644
--- a/units/src/lib.rs
+++ b/units/src/lib.rs
@@ -11,6 +11,8 @@
 #![warn(missing_docs)]
 #![warn(deprecated_in_future)]
 #![doc(test(attr(warn(unused))))]
+// Pedantic lints that we enforce.
+#![warn(clippy::return_self_not_must_use)]
 // Exclude lints we don't think are valuable.
 #![allow(clippy::needless_question_mark)] // https://github.com/rust-bitcoin/rust-bitcoin/pull/2134
 #![allow(clippy::manual_range_contains)] // More readable than clippy's format.