diff --git a/tests/test_warpedvrt.py b/tests/test_warpedvrt.py
index e780830a..d468b2b7 100644
--- a/tests/test_warpedvrt.py
+++ b/tests/test_warpedvrt.py
@@ -60,6 +60,7 @@ def test_warped_vrt(path_rgb_byte_tif):
         assert vrt.mask_flag_enums == ([MaskFlags.nodata],) * 3
 
 
+@requires_gdal21(reason="Nodata deletion requires GDAL 2.1+")
 def test_warped_vrt_add_alpha(path_rgb_byte_tif):
     """A VirtualVRT has the expected VRT properties."""
     with rasterio.open(path_rgb_byte_tif) as src:
@@ -101,7 +102,7 @@ def test_warped_vrt_msk_add_alpha(path_rgb_msk_byte_tif, caplog):
         assert "RGB2.byte.tif.msk" in caplog.text
 
 
-@requires_gdal21(reason="Nodata deletion requires GDAL 2.1+")
+@requires_gdal21(reason="nodata deletion requires gdal 2.1+")
 def test_warped_vrt_msk_nodata(path_rgb_msk_byte_tif, caplog):
     """Specifying dst nodata also works for source with .msk"""
     with rasterio.open(path_rgb_msk_byte_tif) as src:
@@ -120,6 +121,7 @@ def test_warped_vrt_msk_nodata(path_rgb_msk_byte_tif, caplog):
 
         assert "RGB2.byte.tif.msk" in caplog.text
 
+
 def test_warped_vrt_source(path_rgb_byte_tif):
     """A VirtualVRT has the expected source dataset."""
     with rasterio.open(path_rgb_byte_tif) as src: