diff -ur poppler-src-orig/poppler/Object.h poppler-src/poppler/Object.h
--- poppler-src-orig/poppler/Object.h	2016-03-02 00:35:28.000000000 +0100
+++ poppler-src/poppler/Object.h	2016-03-17 10:53:37.000000000 +0100
@@ -147,7 +147,7 @@
   Object *initStream(Stream *streamA);
   Object *initRef(int numA, int genA)
     { initObj(objRef); ref.num = numA; ref.gen = genA; return this; }
-  Object *initCmd(char *cmdA)
+  Object *initCmd(const char *cmdA)
     { initObj(objCmd); cmd = copyString(cmdA); return this; }
   Object *initError()
     { initObj(objError); return this; }
@@ -194,7 +194,7 @@
   GBool isName(const char *nameA)
     { return type == objName && !strcmp(name, nameA); }
   GBool isDict(const char *dictType);
-  GBool isStream(char *dictType);
+  GBool isStream(const char *dictType);
   GBool isCmd(const char *cmdA)
     { return type == objCmd && !strcmp(cmd, cmdA); }
 
@@ -243,7 +243,7 @@
   Object *dictGetValNF(int i, Object *obj);
 
   // Stream accessors.
-  GBool streamIs(char *dictType);
+  GBool streamIs(const char *dictType);
   void streamReset();
   void streamClose();
   int streamGetChar();
@@ -347,10 +347,10 @@
 
 #include "Stream.h"
 
-inline GBool Object::streamIs(char *dictType)
+inline GBool Object::streamIs(const char *dictType)
   { OBJECT_TYPE_CHECK(objStream); return stream->getDict()->is(dictType); }
 
-inline GBool Object::isStream(char *dictType)
+inline GBool Object::isStream(const char *dictType)
   { return type == objStream && streamIs(dictType); }
 
 inline void Object::streamReset()
