diff --git a/lib/util.cpp b/lib/util.cpp
index 9f03fa4a..57e71f9a 100644
--- a/lib/util.cpp
+++ b/lib/util.cpp
@@ -171,14 +171,14 @@ namespace Util{
     maxSize = 0;
   }
 
-  bool ResizeablePointer::assign(void * p, uint32_t l){
+  bool ResizeablePointer::assign(const void * p, uint32_t l){
     if (!allocate(l)){return false;}
     memcpy(ptr, p, l);
     currSize = l;
     return true;
   }
 
-  bool ResizeablePointer::append(void * p, uint32_t l){
+  bool ResizeablePointer::append(const void * p, uint32_t l){
     if (!allocate(l+currSize)){return false;}
     memcpy(((char*)ptr)+currSize, p, l);
     currSize += l;
diff --git a/lib/util.h b/lib/util.h
index d721885f..212e5e28 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -21,8 +21,8 @@ namespace Util{
       ResizeablePointer();
       ~ResizeablePointer();
       inline uint32_t& size(){return currSize;}
-      bool assign(void * p, uint32_t l);
-      bool append(void * p, uint32_t l);
+      bool assign(const void * p, uint32_t l);
+      bool append(const void * p, uint32_t l);
       bool allocate(uint32_t l);
       inline operator char*(){return (char*)ptr;}
       inline operator void*(){return ptr;}