diff --git a/lib/std/io/stream/buffer.c3 b/lib/std/io/stream/buffer.c3
index b3a0a8dc7..eb44bc3c8 100644
--- a/lib/std/io/stream/buffer.c3
+++ b/lib/std/io/stream/buffer.c3
@@ -121,9 +121,9 @@ fn usz! WriteBuffer.write(&self, char[] bytes) @dynamic
 fn void! WriteBuffer.write_byte(&self, char c) @dynamic
 {
 	usz n = self.bytes.len - self.index - 1;
-	if (n == 0) {
+	if (n == 0)
+	{
 		self.write_pending()!;
-		self.index = 0;
 	}
 	self.bytes[self.index] = c;
 	self.index += 1;
diff --git a/releasenotes.md b/releasenotes.md
index f675f8d78..4d73504a6 100644
--- a/releasenotes.md
+++ b/releasenotes.md
@@ -6,6 +6,7 @@
 
 ### Fixes
 - Fix bug where `a > 0 ? f() : g()` could cause a compiler crash if both returned `void!`.
+- Fix issue writing a single byte in the WriteBuffer
 
 ### Stdlib changes