diff --git a/lib/Compilation.js b/lib/Compilation.js
index 7c0937848ef..8fcbea75f45 100644
--- a/lib/Compilation.js
+++ b/lib/Compilation.js
@@ -113,8 +113,6 @@ class Compilation extends Tapable {
 				cacheModule.errors.forEach(err => this.errors.push(err), this);
 				cacheModule.warnings.forEach(err => this.warnings.push(err), this);
 				return cacheModule;
-			} else {
-				module.lastId = cacheModule.id;
 			}
 		}
 		module.unbuild();
diff --git a/lib/Module.js b/lib/Module.js
index 72400725751..a213bfa1a3a 100644
--- a/lib/Module.js
+++ b/lib/Module.js
@@ -28,7 +28,6 @@ class Module extends DependenciesBlock {
 		this.context = null;
 		this.reasons = [];
 		this.debugId = debugId++;
-		this.lastId = -1;
 		this.id = null;
 		this.portableId = null;
 		this.index = null;
@@ -50,7 +49,6 @@ class Module extends DependenciesBlock {
 
 	disconnect() {
 		this.reasons.length = 0;
-		this.lastId = this.id;
 		this.id = null;
 		this.index = null;
 		this.index2 = null;
@@ -64,7 +62,6 @@ class Module extends DependenciesBlock {
 	}
 
 	unseal() {
-		this.lastId = this.id;
 		this.id = null;
 		this.index = null;
 		this.index2 = null;