diff --git a/parity-util-mem/Cargo.toml b/parity-util-mem/Cargo.toml
index e15e460c1..ff69fc3aa 100644
--- a/parity-util-mem/Cargo.toml
+++ b/parity-util-mem/Cargo.toml
@@ -21,6 +21,7 @@ hashbrown = { version = "0.6", optional = true }
 mimallocator = { version = "0.1.3", features = ["secure"], optional = true }
 mimalloc-sys = { version = "0.1.6", optional = true }
 parity-util-mem-derive = { path = "derive", version = "0.1" }
+impl-trait-for-tuples = "0.1.3"
 
 smallvec = { version = "1.0.0", optional = true }
 ethereum-types = { version = "0.8.0", optional = true, path = "../ethereum-types" }
diff --git a/parity-util-mem/src/malloc_size.rs b/parity-util-mem/src/malloc_size.rs
index 3c26a917a..b9761527f 100644
--- a/parity-util-mem/src/malloc_size.rs
+++ b/parity-util-mem/src/malloc_size.rs
@@ -261,42 +261,12 @@ impl<T: MallocSizeOf + ?Sized> MallocSizeOf for Box<T> {
 	}
 }
 
-impl MallocSizeOf for () {
-	fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
-		0
-	}
-}
-
-impl<T1, T2> MallocSizeOf for (T1, T2)
-where
-	T1: MallocSizeOf,
-	T2: MallocSizeOf,
-{
-	fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
-		self.0.size_of(ops) + self.1.size_of(ops)
-	}
-}
-
-impl<T1, T2, T3> MallocSizeOf for (T1, T2, T3)
-where
-	T1: MallocSizeOf,
-	T2: MallocSizeOf,
-	T3: MallocSizeOf,
-{
-	fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
-		self.0.size_of(ops) + self.1.size_of(ops) + self.2.size_of(ops)
-	}
-}
-
-impl<T1, T2, T3, T4> MallocSizeOf for (T1, T2, T3, T4)
-where
-	T1: MallocSizeOf,
-	T2: MallocSizeOf,
-	T3: MallocSizeOf,
-	T4: MallocSizeOf,
-{
+#[impl_trait_for_tuples::impl_for_tuples(12)]
+impl MallocSizeOf for Tuple {
 	fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
-		self.0.size_of(ops) + self.1.size_of(ops) + self.2.size_of(ops) + self.3.size_of(ops)
+		let mut result = 0;
+		for_tuples!( #( result += Tuple.size_of(ops); )* );
+		result
 	}
 }
 
diff --git a/parity-util-mem/tests/derive.rs b/parity-util-mem/tests/derive.rs
index 34674fd5f..87f8c9f50 100644
--- a/parity-util-mem/tests/derive.rs
+++ b/parity-util-mem/tests/derive.rs
@@ -76,3 +76,17 @@ fn derive_morecomplex() {
 
 	assert!(t.malloc_size_of() > 8000);
 }
+
+#[test]
+fn derive_tuple() {
+	#[derive(MallocSizeOf)]
+	struct Trivia {
+		tp1: (),
+		tp2: (Vec<u8>, Vec<u8>),
+	}
+
+	let t = Trivia { tp1: (), tp2: (vec![7u8; 1024], vec![9u8; 1024]) };
+
+	assert!(t.malloc_size_of() > 2000);
+	assert!(t.malloc_size_of() < 3000);
+}