diff --git a/oss-internship-2020/gdal/raster_to_gtiff/gtiff_converter.cc b/oss-internship-2020/gdal/raster_to_gtiff/gtiff_converter.cc
index 7cbd34d..b858440 100644
--- a/oss-internship-2020/gdal/raster_to_gtiff/gtiff_converter.cc
+++ b/oss-internship-2020/gdal/raster_to_gtiff/gtiff_converter.cc
@@ -51,7 +51,6 @@ absl::Status RasterToGTiffProcessor::Main() {
   sapi::v::RemotePtr driver_ptr(driver.value());
 
   sapi::v::ConstCStr out_file_full_path_ptr(out_file_full_path_.c_str());
-  sapi::v::NullPtr create_options;
 
   GDALDataType type = data_.bands.size() > 0
                           ? static_cast<GDALDataType>(data_.bands[0].data_type)
@@ -61,7 +60,7 @@ absl::Status RasterToGTiffProcessor::Main() {
       absl::StatusOr<GDALDatasetH> dataset,
       api.GDALCreate(&driver_ptr, out_file_full_path_ptr.PtrBefore(),
                      data_.width, data_.height, data_.bands.size(), type,
-                     &create_options));
+                     nullptr));
 
   TRANSACTION_FAIL_IF_NOT(dataset.value(), "Error creating dataset");
   sapi::v::RemotePtr dataset_ptr(dataset.value());
diff --git a/oss-internship-2020/libpng/examples/example1.cc b/oss-internship-2020/libpng/examples/example1.cc
index d9991f2..e3ad71c 100644
--- a/oss-internship-2020/libpng/examples/example1.cc
+++ b/oss-internship-2020/libpng/examples/example1.cc
@@ -44,10 +44,9 @@ absl::Status LibPNGMain(const std::string& infile, const std::string& outfile) {
 
   sapi::v::Array<uint8_t> buffer(PNG_IMAGE_SIZE(*image.mutable_data()));
 
-  sapi::v::NullPtr null = sapi::v::NullPtr();
-  SAPI_ASSIGN_OR_RETURN(result,
-                        api.png_image_finish_read(image.PtrBoth(), &null,
-                                                  buffer.PtrBoth(), 0, &null));
+  SAPI_ASSIGN_OR_RETURN(
+      result, api.png_image_finish_read(image.PtrBoth(), nullptr,
+                                        buffer.PtrBoth(), 0, nullptr));
   if (!result) {
     return absl::InternalError(
         absl::StrCat("finish read error: ", image.mutable_data()->message));
@@ -55,7 +54,7 @@ absl::Status LibPNGMain(const std::string& infile, const std::string& outfile) {
 
   SAPI_ASSIGN_OR_RETURN(result, api.png_image_write_to_file(
                                     image.PtrBoth(), outfile_var.PtrBefore(), 0,
-                                    buffer.PtrBoth(), 0, &null));
+                                    buffer.PtrBoth(), 0, nullptr));
   if (!result) {
     return absl::InternalError(
         absl::StrCat("write error: ", image.mutable_data()->message));
diff --git a/oss-internship-2020/libpng/tests/basic_test.cc b/oss-internship-2020/libpng/tests/basic_test.cc
index 176479b..24d546a 100644
--- a/oss-internship-2020/libpng/tests/basic_test.cc
+++ b/oss-internship-2020/libpng/tests/basic_test.cc
@@ -64,9 +64,8 @@ TEST(SandboxTest, ReadWrite) {
       << "image version changed";
 
   sapi::v::Array<uint8_t> buffer(PNG_IMAGE_SIZE(*image.mutable_data()));
-  sapi::v::NullPtr null = sapi::v::NullPtr();
-  status_or_int = api.png_image_finish_read(image.PtrBoth(), &null,
-                                            buffer.PtrBoth(), 0, &null);
+  status_or_int = api.png_image_finish_read(image.PtrBoth(), nullptr,
+                                            buffer.PtrBoth(), 0, nullptr);
   ASSERT_THAT(status_or_int, IsOk())
       << "fatal error when invoking png_image_finish_read";
   ASSERT_THAT(status_or_int.value(), IsTrue())
@@ -76,8 +75,9 @@ TEST(SandboxTest, ReadWrite) {
   ASSERT_THAT(image.mutable_data()->format, Eq(PNG_FORMAT_RGBA))
       << "image format changed";
 
-  status_or_int = api.png_image_write_to_file(
-      image.PtrBoth(), outfile_var.PtrBefore(), 0, buffer.PtrBoth(), 0, &null);
+  status_or_int =
+      api.png_image_write_to_file(image.PtrBoth(), outfile_var.PtrBefore(), 0,
+                                  buffer.PtrBoth(), 0, nullptr);
   ASSERT_THAT(status_or_int, IsOk())
       << "fatal error when invoking png_image_write_to_file";
   ASSERT_THAT(status_or_int.value(), IsTrue())
diff --git a/oss-internship-2020/libuv/examples/idle-basic.cc b/oss-internship-2020/libuv/examples/idle-basic.cc
index f4ed3ad..8b758cd 100644
--- a/oss-internship-2020/libuv/examples/idle-basic.cc
+++ b/oss-internship-2020/libuv/examples/idle-basic.cc
@@ -86,8 +86,7 @@ absl::Status IdleBasic() {
   }
 
   // Close idler
-  sapi::v::NullPtr null_ptr;
-  SAPI_RETURN_IF_ERROR(api.sapi_uv_close(&idler, &null_ptr));
+  SAPI_RETURN_IF_ERROR(api.sapi_uv_close(&idler, nullptr));
 
   // Close loop
   SAPI_ASSIGN_OR_RETURN(return_code, api.sapi_uv_loop_close(&loop));