--- poppler/XRef.cc
+++ poppler/XRef.cc
@@ -293,6 +293,7 @@
   xRefStream = gFalse;
   scannedSpecialFlags = gFalse;
   encrypted = gFalse;
+  encAlgorithm = cryptRC4;
   permFlags = defPermFlags;
   ownerPasswordOk = gFalse;
   rootNum = -1;