diff --git a/internal/mock/grpc_server.go b/internal/mock/grpc_server.go
index 1ad07aad830570c53cf331048683da3f3c696701..19361e95866198f6ad2bba7a5195ab213ca7a4a6 100644
--- a/internal/mock/grpc_server.go
+++ b/internal/mock/grpc_server.go
@@ -127,7 +127,7 @@ func StartGrpcServer() *grpc.Server {
 
 	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", GrpcMockPort))
 	if err != nil {
-		log.Fatal("gRPC server failed to listen: %v", err)
+		log.Fatal(fmt.Sprintf("gRPC server failed to listen: %v", err))
 	}
 
 	log.Info(fmt.Sprintf("gRPC server listening on port %d", GrpcMockPort))