diff --git a/plugins/node/opentelemetry-instrumentation-fastify/src/instrumentation.ts b/plugins/node/opentelemetry-instrumentation-fastify/src/instrumentation.ts
index 6ed80ca648..4f6df78268 100644
--- a/plugins/node/opentelemetry-instrumentation-fastify/src/instrumentation.ts
+++ b/plugins/node/opentelemetry-instrumentation-fastify/src/instrumentation.ts
@@ -209,7 +209,7 @@ export class FastifyInstrumentation extends InstrumentationBase {
     return fastify;
   }
 
-  public _patchSend() {
+  private _patchSend() {
     const instrumentation = this;
     this._diag.debug('Patching fastify reply.send function');
 
@@ -238,7 +238,7 @@ export class FastifyInstrumentation extends InstrumentationBase {
     };
   }
 
-  public _hookPreHandler() {
+  private _hookPreHandler() {
     const instrumentation = this;
     this._diag.debug('Patching fastify preHandler function');