diff --git a/runtime/helpers/mipmap.cpp b/runtime/helpers/mipmap.cpp
index bd02d3b276..1d48a5f8c6 100644
--- a/runtime/helpers/mipmap.cpp
+++ b/runtime/helpers/mipmap.cpp
@@ -27,6 +27,7 @@
 #include "runtime/mem_obj/image.h"
 
 #include <cstdint>
+#include <limits>
 
 namespace OCLRT {
 
@@ -44,7 +45,7 @@ uint32_t getMipLevelOriginIdx(cl_mem_object_type imageType) {
         return 0;
     default:
         DEBUG_BREAK_IF(true);
-        return -1;
+        return std::numeric_limits<uint32_t>::max();
     }
 }
 
diff --git a/runtime/os_interface/windows/os_time_win.cpp b/runtime/os_interface/windows/os_time_win.cpp
index 27e22f377a..eafcb6b4fe 100644
--- a/runtime/os_interface/windows/os_time_win.cpp
+++ b/runtime/os_interface/windows/os_time_win.cpp
@@ -34,8 +34,6 @@ bool runEscape(Wddm *wddm, TimeStampDataHeader &escapeInfo) {
         D3DKMT_ESCAPE escapeCommand = {0};
 
         GTDIGetGpuCpuTimestampsIn in = {GTDI_FNC_GET_GPU_CPU_TIMESTAMPS};
-        GTDIGetGpuCpuTimestampsOut out = {GTDI_RET_FAILED, 0};
-        uint32_t inSize = sizeof(GTDIGetGpuCpuTimestampsIn);
         uint32_t outSize = sizeof(GTDIGetGpuCpuTimestampsOut);
 
         escapeInfo.m_Header.EscapeCode = GFX_ESCAPE_IGPA_INSTRUMENTATION_CONTROL;
@@ -92,7 +90,7 @@ std::unique_ptr<OSTime> OSTime::create(OSInterface *osInterface) {
     return std::unique_ptr<OSTime>(new OSTimeWin(osInterface));
 }
 
-OSTimeWin::OSTimeWin(OSInterface *osInterface) : wddm(nullptr) {
+OSTimeWin::OSTimeWin(OSInterface *osInterface) {
     this->osInterface = osInterface;
     if (osInterface) {
         wddm = osInterface->get()->getWddm();
diff --git a/runtime/os_interface/windows/os_time_win.h b/runtime/os_interface/windows/os_time_win.h
index 53a6655b4b..4c1c86654d 100644
--- a/runtime/os_interface/windows/os_time_win.h
+++ b/runtime/os_interface/windows/os_time_win.h
@@ -39,9 +39,9 @@ class OSTimeWin : public OSTime {
     uint64_t getCpuRawTimestamp() override;
 
   protected:
-    Wddm *wddm;
+    Wddm *wddm = nullptr;
     LARGE_INTEGER frequency;
-    OSTimeWin() {}
+    OSTimeWin() = default;
     decltype(&QueryPerformanceCounter) QueryPerfomanceCounterFnc = QueryPerformanceCounter;
 };
 
diff --git a/runtime/os_interface/windows/print.cpp b/runtime/os_interface/windows/print.cpp
index 2b561c938f..c409b18b3f 100644
--- a/runtime/os_interface/windows/print.cpp
+++ b/runtime/os_interface/windows/print.cpp
@@ -30,7 +30,6 @@
 #include <fcntl.h>
 
 void printToSTDOUT(const char *str) {
-    int bytesRead = 0;
     int fd = 0;
     HANDLE stdoutDuplicate = 0;
     FILE *pFile = nullptr;
diff --git a/runtime/os_interface/windows/wddm_memory_manager.cpp b/runtime/os_interface/windows/wddm_memory_manager.cpp
index bb6a48ee2d..0463615fa9 100644
--- a/runtime/os_interface/windows/wddm_memory_manager.cpp
+++ b/runtime/os_interface/windows/wddm_memory_manager.cpp
@@ -645,8 +645,6 @@ void WddmMemoryManager::trimResidency(D3DDDI_TRIMRESIDENCYSET_FLAGS flags, uint6
 
         acquireResidencyLock();
 
-        size_t size = trimCandidateList.size();
-
         WddmAllocation *wddmAllocation = nullptr;
         while ((wddmAllocation = getTrimCandidateHead()) != nullptr) {
 
@@ -657,7 +655,6 @@ void WddmMemoryManager::trimResidency(D3DDDI_TRIMRESIDENCYSET_FLAGS flags, uint6
 
                 DBG_LOG(ResidencyDebugEnable, "Residency:", __FUNCTION__, "allocation: handle =", wddmAllocation->handle, "lastFence =", (wddmAllocation)->getResidencyData().lastFence);
 
-                size_t fragmentsSizeToEvict = 0;
                 uint32_t fragmentsToEvict = 0;
 
                 if (wddmAllocation->fragmentsStorage.fragmentCount == 0) {
diff --git a/runtime/utilities/windows/timer_util.cpp b/runtime/utilities/windows/timer_util.cpp
index 9103711240..058baf64b1 100644
--- a/runtime/utilities/windows/timer_util.cpp
+++ b/runtime/utilities/windows/timer_util.cpp
@@ -47,7 +47,6 @@ class Timer::TimerImpl {
     }
 
     long long int get() {
-        long long int nanosecondTime = 0;
         auto timeDelta = (double)(m_endTime.QuadPart - m_startTime.QuadPart);
         timeDelta /= (double)mFrequency.QuadPart;
         timeDelta *= 1000000000.0;