diff --git a/lib/glloader.c b/lib/glloader.c
index 11c8104756..bac141324a 100644
--- a/lib/glloader.c
+++ b/lib/glloader.c
@@ -985,7 +985,9 @@ ktxTexture2_GLUpload(ktxTexture2* This, GLuint* pTexture, GLenum* pTarget,
             return KTX_INVALID_OPERATION;
         }
     } else {
-       // TODO Check DFD for ASTC HDR or 3D or RGB[DEM] and figure out format.
+       // TODO: Check DFD for ASTC HDR or 3D or RGB[DEM] and figure out format.
+       return KTX_INVALID_OPERATION; // BasisU textures must be transcoded
+                                     // before upload.
     }
 
     formatInfo.glFormat = glGetFormatFromInternalFormat(formatInfo.glInternalformat);
diff --git a/tools/ktx2check/ktx2check.cpp b/tools/ktx2check/ktx2check.cpp
index 5ea8ce5a69..6802b5f6c5 100644
--- a/tools/ktx2check/ktx2check.cpp
+++ b/tools/ktx2check/ktx2check.cpp
@@ -1439,7 +1439,10 @@ ktxValidator::validateDfd(validationContext& ctx)
 
                     if (result & i_FLOAT_FORMAT_BIT)
                         findStr += "FLOAT";
-                    if (result & i_NORMALIZED_FORMAT_BIT)
+                    // else here because Vulkan format names do not reflect
+                    // both normalized and float. E.g, BC6H is just
+                    // VK_FORMAT_BC6H_[SU]FLOAT_BLOCK.
+                    else if (result & i_NORMALIZED_FORMAT_BIT)
                         findStr += "NORM";
                     else
                         findStr += "INT";