diff --git a/xpdf/GlobalParams.cc b/xpdf/GlobalParams.cc
index ea7e9fd..06229e9 100644
--- a/xpdf/GlobalParams.cc
+++ b/xpdf/GlobalParams.cc
@@ -690,7 +690,7 @@ GlobalParams::GlobalParams(const char *cfgFileName) {
   base14SysFonts = new GHash(gTrue);
   sysFonts = new SysFontList();
 #if HAVE_PAPER_H
-  char *paperName;
+  const char *paperName;
   const struct paper *paperType;
   paperinit();
   if ((paperName = systempapername())) {