diff --git a/keccak_asm.go b/keccak_asm.go
index 37ce284..fc22b4f 100644
--- a/keccak_asm.go
+++ b/keccak_asm.go
@@ -36,6 +36,15 @@ func (s *sponge) Write(p []byte) (int, error) {
 		panic("keccak: Write after Read")
 	}
 	n := len(p)
+	if n == 1 {
+		s.buf[s.absorbed] = p[0]
+		s.absorbed++
+		if s.absorbed == rate {
+			xorAndPermute(&s.state, &s.buf[0])
+			s.absorbed = 0
+		}
+		return 1, nil
+	}
 	if s.absorbed > 0 {
 		x := copy(s.buf[s.absorbed:rate], p)
 		s.absorbed += x
diff --git a/keccak_write_bench_test.go b/keccak_write_bench_test.go
new file mode 100644
index 0000000..7304e31
--- /dev/null
+++ b/keccak_write_bench_test.go
@@ -0,0 +1,23 @@
+package keccak
+
+import (
+	"strconv"
+	"testing"
+)
+
+func BenchmarkHasherOneByteWrites(b *testing.B) {
+	for _, size := range []int{32, 128, 256} {
+		b.Run(strconv.Itoa(size), func(b *testing.B) {
+			data := make([]byte, size)
+			b.SetBytes(int64(size))
+			b.ReportAllocs()
+			for b.Loop() {
+				var h Hasher
+				for i := range data {
+					h.Write(data[i : i+1])
+				}
+				h.Sum256()
+			}
+		})
+	}
+}