diff --git a/internal/processing/midi-message-decode.go b/internal/processing/midi-message-decode.go
index f594671..d3b9556 100644
--- a/internal/processing/midi-message-decode.go
+++ b/internal/processing/midi-message-decode.go
@@ -1,3 +1,5 @@
+//go:build cgo
+
 package processing
 
 import (
diff --git a/internal/processing/midi-message-encode.go b/internal/processing/midi-message-encode.go
index 37118dc..56a7da1 100644
--- a/internal/processing/midi-message-encode.go
+++ b/internal/processing/midi-message-encode.go
@@ -1,3 +1,5 @@
+//go:build cgo
+
 package processing
 
 import (
diff --git a/midi-client.go b/midi-client.go
index 291d946..d91c4e0 100644
--- a/midi-client.go
+++ b/midi-client.go
@@ -1,3 +1,5 @@
+//go:build cgo
+
 package showbridge
 
 import (