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-rw-r--r--libqpdf/Pl_PNGFilter.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/libqpdf/Pl_PNGFilter.cc b/libqpdf/Pl_PNGFilter.cc
index d62aec56..7914b3b6 100644
--- a/libqpdf/Pl_PNGFilter.cc
+++ b/libqpdf/Pl_PNGFilter.cc
@@ -62,7 +62,7 @@ Pl_PNGFilter::Pl_PNGFilter(
}
void
-Pl_PNGFilter::write(unsigned char* data, size_t len)
+Pl_PNGFilter::write(unsigned char const* data, size_t len)
{
size_t left = this->incoming - this->pos;
size_t offset = 0;