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-rw-r--r--libqpdf/Pl_PNGFilter.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libqpdf/Pl_PNGFilter.cc b/libqpdf/Pl_PNGFilter.cc
index 730d6d98..174e0b51 100644
--- a/libqpdf/Pl_PNGFilter.cc
+++ b/libqpdf/Pl_PNGFilter.cc
@@ -3,6 +3,7 @@
#include <stdexcept>
#include <string.h>
#include <limits.h>
+#include <algorithm>
Pl_PNGFilter::Pl_PNGFilter(char const* identifier, Pipeline* next,
action_e action, unsigned int columns,