diff --git a/lib/Backends/NNPI/NNPIResource.cpp b/lib/Backends/NNPI/NNPIResource.cpp
index 93d314ce2..efc6890de 100644
--- a/lib/Backends/NNPI/NNPIResource.cpp
+++ b/lib/Backends/NNPI/NNPIResource.cpp
@@ -255,7 +255,7 @@ bool NNPIResource::init(const NNPIObjectName name,
   // Create device resource.
   bool allocateDeviceResource = false;
 
-  shared_ptr<NNPIResource> sharedResource = nullptr;
+  std::shared_ptr<NNPIResource> sharedResource = nullptr;
   if (phUsage) {
     sharedResource = findResourceForDevice(*users, device_);
   }
diff --git a/lib/Backends/NNPI/NNPIUtils.cpp b/lib/Backends/NNPI/NNPIUtils.cpp
index 3bfc06ba7..60ee0544e 100644
--- a/lib/Backends/NNPI/NNPIUtils.cpp
+++ b/lib/Backends/NNPI/NNPIUtils.cpp
@@ -47,7 +47,7 @@ void DotWriter::clear() {
 
 void DotWriter::addNode(std::string name, std::string label, unsigned color,
                         std::string subGraph) {
-  ostringstream os;
+  std::ostringstream os;
   os << name << " [\n";
   os << "\tlabel = \"" << label << "\"\n";
   os << "\tstyle=\"filled,rounded\"\n";
diff --git a/lib/Backends/NNPI/NNPIUtils.h b/lib/Backends/NNPI/NNPIUtils.h
index 4922237c7..27abbe1d0 100644
--- a/lib/Backends/NNPI/NNPIUtils.h
+++ b/lib/Backends/NNPI/NNPIUtils.h
@@ -22,8 +22,6 @@
 #include <string>
 #include <vector>
 
-using namespace std;
-
 enum NNPIAVXType { NNPI_AVX_NONE = 0, NNPI_AVX_AVX512 };
 
 inline void convertI64toI32(int64_t const *i64Data, int32_t *i32Data,