diff --git a/internal/server/grpc.go b/internal/server/grpc.go
index 55f8e1e..a440bd9 100644
--- a/internal/server/grpc.go
+++ b/internal/server/grpc.go
@@ -15,10 +15,6 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
-// APIListenerCountDeltaFunc is a function that is called when the number of
-// API clients increments or decrements.
-type APIClientCountDeltaFunc func(delta int)
-
 // Server is the gRPC server that handles incoming commands and outgoing
 // events.
 type Server struct {