diff --git a/src/plain.rs b/src/plain.rs
index 3552200..954c9fc 100644
--- a/src/plain.rs
+++ b/src/plain.rs
@@ -94,3 +94,21 @@ where
     S: Plain,
 {
 }
+
+// Must be same element type to avoid padding
+unsafe impl<A: Plain> Plain for (A,) {}
+unsafe impl<A: Plain> Plain for (A,A) {}
+unsafe impl<A: Plain> Plain for (A,A,A) {}
+unsafe impl<A: Plain> Plain for (A,A,A,A) {}
+unsafe impl<A: Plain> Plain for (A,A,A,A,A) {}
+unsafe impl<A: Plain> Plain for (A,A,A,A,A,A) {}
+unsafe impl<A: Plain> Plain for (A,A,A,A,A,A,A) {}
+unsafe impl<A: Plain> Plain for (A,A,A,A,A,A,A,A) {}
+
+macro_rules! impl_array {
+    ($($n:tt)+) => {
+        $(unsafe impl<A: Plain> Plain for [A; $n] {})+
+    }
+}
+
+impl_array! {1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 64 128 256 1024}
diff --git a/src/tests.rs b/src/tests.rs
index 4a31044..5bcf5d2 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -134,3 +134,13 @@ fn basic_function() {
     assert!(r7[0] == 0xaaaaaaaaaaaaaaaau64);
     assert!(r7[1] == 0xbbbbbbbbccccddeeu64 || r7[1] == 0xeeddccccbbbbbbbbu64);
 }
+
+#[test]
+fn tuples_and_arrays() {
+    fn is_plain<T: Plain>(_: T) {}
+
+    is_plain((1u8,));
+    is_plain((1u8, 2u8, 3u8));
+    is_plain([0u8; 17]);
+    is_plain([0u8; 32]);
+}