diff --git a/os/code/os/src/main/java/com/scaler/producerconsumer/Consumer.java b/os/code/os/src/main/java/com/scaler/producerconsumer/Consumer.java
index b37dc96..4822c7a 100644
--- a/os/code/os/src/main/java/com/scaler/producerconsumer/Consumer.java
+++ b/os/code/os/src/main/java/com/scaler/producerconsumer/Consumer.java
@@ -12,16 +12,17 @@ public class Consumer implements Runnable {
     private Queue<UnitOfWork> store;
     private String name;
 
-
     @Override
     public void run() {
-       while (true) {
-        if (store.size() > 0) {
-            store.remove();
-            System.out.println("Consumed: " + name + " Left units :" + store.size());
+        while (true) {
+            synchronized (store) {
+                if (store.size() > 0) {
+                    store.remove();
+                    System.out.println("Consumed: " + name + " Left units :" + store.size());
+                }
+            }
         }
-       }
-        
+
     }
-    
+
 }
diff --git a/os/code/os/src/main/java/com/scaler/producerconsumer/Producer.java b/os/code/os/src/main/java/com/scaler/producerconsumer/Producer.java
index acefd12..b360808 100644
--- a/os/code/os/src/main/java/com/scaler/producerconsumer/Producer.java
+++ b/os/code/os/src/main/java/com/scaler/producerconsumer/Producer.java
@@ -13,16 +13,17 @@ public class Producer implements Runnable {
     private int maxSize;
     private String name;
 
-
     @Override
     public void run() {
-       while (true) {
-        if (store.size() < maxSize) {
-            store.add(new UnitOfWork());
-            System.out.println("Produced: " + name + " Left units :" + store.size());
+        while (true) {
+            synchronized (store) {
+                if (store.size() < maxSize) {
+                    store.add(new UnitOfWork());
+                    System.out.println("Produced: " + name + " Left units :" + store.size());
+                }
+            }
         }
-       }
-        
+
     }
-    
+
 }
diff --git a/os/code/os/target/classes/com/scaler/producerconsumer/Consumer.class b/os/code/os/target/classes/com/scaler/producerconsumer/Consumer.class
index ed16821..e35dd5b 100644
Binary files a/os/code/os/target/classes/com/scaler/producerconsumer/Consumer.class and b/os/code/os/target/classes/com/scaler/producerconsumer/Consumer.class differ
diff --git a/os/code/os/target/classes/com/scaler/producerconsumer/Producer.class b/os/code/os/target/classes/com/scaler/producerconsumer/Producer.class
index 3761e03..c554525 100644
Binary files a/os/code/os/target/classes/com/scaler/producerconsumer/Producer.class and b/os/code/os/target/classes/com/scaler/producerconsumer/Producer.class differ