diff --git a/modules/custom_operations/user_ie_extensions/include/openvino_extensions/strings.hpp b/modules/custom_operations/user_ie_extensions/include/openvino_extensions/strings.hpp
index 5bfe85e5a..c970d0db9 100644
--- a/modules/custom_operations/user_ie_extensions/include/openvino_extensions/strings.hpp
+++ b/modules/custom_operations/user_ie_extensions/include/openvino_extensions/strings.hpp
@@ -13,7 +13,7 @@ namespace openvino_extensions {
 // Tensor destination will be reshaped according the input data
 template <typename BatchOfStrings>
 void pack_strings(const BatchOfStrings& strings, ov::Tensor& destination) {
-    auto batch_size = strings.size();
+    size_t batch_size = strings.size();
 
     // First run over all elements: calculate total memory required to hold all strings
     size_t symbols_size = std::accumulate(
@@ -25,7 +25,7 @@ void pack_strings(const BatchOfStrings& strings, ov::Tensor& destination) {
     destination.set_shape({total_size});
 
     int32_t* pindices = reinterpret_cast<int32_t*>(destination.data<uint8_t>());
-    pindices[0] = batch_size;
+    pindices[0] = int32_t(batch_size);
     pindices[1] = 0;
     pindices += 2;
     char* psymbols = reinterpret_cast<char*>(pindices + batch_size);
@@ -34,25 +34,25 @@ void pack_strings(const BatchOfStrings& strings, ov::Tensor& destination) {
     for (const auto& str: strings) {
         psymbols = std::copy(str.begin(), str.end(), psymbols);
         current_symbols_pos += str.size();
-        *pindices = current_symbols_pos;
-	++pindices;
+        *pindices = int32_t(current_symbols_pos);
+        ++pindices;
     }
 }
 
 std::vector<std::string> unpack_strings(const ov::Tensor& source) {
-    int32_t length = source.get_byte_size();
+    size_t length = source.get_byte_size();
     // check the format of the input bitstream representing the string tensor
     OPENVINO_ASSERT(length >= 4, "Incorrect packed string tensor format: no batch size in the packed string tensor");
     const int32_t* pindices = reinterpret_cast<const int32_t*>(source.data<const uint8_t>());
     int32_t batch_size = pindices[0];
-    OPENVINO_ASSERT(length >= 4 + 4 + 4 * batch_size,
+    OPENVINO_ASSERT(int32_t(length) >= 4 + 4 + 4 * batch_size,
         "Incorrect packed string tensor format: the packed string tensor must contain first string offset and end indices");
     const int32_t* begin_ids = pindices + 1;
     const int32_t* end_ids = pindices + 2;
     const char* symbols = reinterpret_cast<const char*>(pindices + 2 + batch_size);
 
     std::vector<std::string> result;
-    result.reserve(batch_size);
+    result.reserve(size_t(batch_size));
     for (int32_t idx = 0; idx < batch_size; ++idx) {
         result.emplace_back(symbols + begin_ids[idx], symbols + end_ids[idx]);
     }