diff --git a/ArmnnPreparedModel.cpp b/ArmnnPreparedModel.cpp
index 77709b0..388a111 100644
--- a/ArmnnPreparedModel.cpp
+++ b/ArmnnPreparedModel.cpp
@@ -129,7 +129,7 @@
     if (asyncModelExecutionEnabled)
     {
         std::vector<std::shared_ptr<armnn::IWorkingMemHandle>> memHandles;
-        for (int i=0; i < numberOfThreads; ++i)
+        for (unsigned int i=0; i < numberOfThreads; ++i)
         {
             memHandles.emplace_back(m_Runtime->CreateWorkingMemHandle(networkId));
         }
diff --git a/ArmnnPreparedModel_1_2.cpp b/ArmnnPreparedModel_1_2.cpp
index 07fd5a6..e46b5be 100644
--- a/ArmnnPreparedModel_1_2.cpp
+++ b/ArmnnPreparedModel_1_2.cpp
@@ -164,7 +164,7 @@
     if (asyncModelExecutionEnabled)
     {
         std::vector<std::shared_ptr<armnn::IWorkingMemHandle>> memHandles;
-        for (int i=0; i < numberOfThreads; ++i)
+        for (unsigned int i=0; i < numberOfThreads; ++i)
         {
             memHandles.emplace_back(m_Runtime->CreateWorkingMemHandle(networkId));
         }
diff --git a/ArmnnPreparedModel_1_3.cpp b/ArmnnPreparedModel_1_3.cpp
index cd3df51..dcac281 100644
--- a/ArmnnPreparedModel_1_3.cpp
+++ b/ArmnnPreparedModel_1_3.cpp
@@ -186,7 +186,7 @@
     if (asyncModelExecutionEnabled)
     {
         std::vector<std::shared_ptr<armnn::IWorkingMemHandle>> memHandles;
-        for (int i=0; i < numberOfThreads; ++i)
+        for (unsigned int i=0; i < numberOfThreads; ++i)
         {
             memHandles.emplace_back(m_Runtime->CreateWorkingMemHandle(networkId));
         }