diff --git a/src/plugins/intel_npu/src/plugin/src/metadata.cpp b/src/plugins/intel_npu/src/plugin/src/metadata.cpp
index b33993096ad62d..ce60641f415b0d 100644
--- a/src/plugins/intel_npu/src/plugin/src/metadata.cpp
+++ b/src/plugins/intel_npu/src/plugin/src/metadata.cpp
@@ -11,6 +11,7 @@
 #include "intel_npu/config/config.hpp"
 #include "intel_npu/utils/logger/logger.hpp"
 #include "openvino/core/version.hpp"
+#include "openvino/runtime/shared_buffer.hpp"
 
 namespace {
 
@@ -20,10 +21,10 @@ std::streampos getFileSize(std::istream& stream) {
         OPENVINO_THROW("Stream is in bad status! Please check the passed stream status!");
     }
 
-    if (stream.rdbuf()->in_avail() != 0) {
-        // ov::OwningSharedStreamBuffer scenario
+    if (dynamic_cast<ov::OwningSharedStreamBuffer*>(stream.rdbuf()) != nullptr) {
         return stream.rdbuf()->in_avail() + stream.tellg();
     }
+
     const std::streampos streamStart = stream.tellg();
     stream.seekg(0, std::ios_base::end);
     const std::streampos streamEnd = stream.tellg();
diff --git a/src/plugins/intel_npu/src/plugin/src/plugin.cpp b/src/plugins/intel_npu/src/plugin/src/plugin.cpp
index 313dd1aeea6534..dfef6d475024de 100644
--- a/src/plugins/intel_npu/src/plugin/src/plugin.cpp
+++ b/src/plugins/intel_npu/src/plugin/src/plugin.cpp
@@ -749,7 +749,7 @@ std::shared_ptr<ov::ICompiledModel> Plugin::import_model(std::istream& stream, c
         stream.seekg(stream_start_pos);
         return ov::npuw::LLMCompiledModel::deserialize(stream, shared_from_this());
     }
-    stream.seekg(stream_start_pos);
+    stream.seekg(-stream.tellg() + stream_start_pos, std::ios::cur);
 
     // Drop NPUW properties if there are any
     ov::AnyMap npu_plugin_properties;