diff --git a/tests/Images/External/ReferenceOutput/PngEncoderTests/Issue2668_Quantized_Encode_Alpha_Rgba32_issue_2668.png b/tests/Images/External/ReferenceOutput/PngEncoderTests/Issue2668_Quantized_Encode_Alpha_Rgba32_Issue_2668.png
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rename from tests/Images/External/ReferenceOutput/PngEncoderTests/Issue2668_Quantized_Encode_Alpha_Rgba32_issue_2668.png
rename to tests/Images/External/ReferenceOutput/PngEncoderTests/Issue2668_Quantized_Encode_Alpha_Rgba32_Issue_2668.png