diff --git a/rp06.cpp b/rp06.cpp
index 6fd2ffb..3fe5b97 100644
--- a/rp06.cpp
+++ b/rp06.cpp
@@ -106,7 +106,7 @@ void rp06::write_byte(const uint16_t addr, const uint8_t v)
 		vtemp |= v;
 	}
 
-	write_word(addr, vtemp);
+	write_word(addr & ~1, vtemp);
 }
 
 uint32_t rp06::compute_offset() const