diff --git a/src/common/memory.cpp b/src/common/memory.cpp
index fbd7617e0..30c57720f 100644
--- a/src/common/memory.cpp
+++ b/src/common/memory.cpp
@@ -37,7 +37,7 @@ memory_c::resize(size_t new_size)
 }
 
 void
-memory_c::add(unsigned char *new_buffer,
+memory_c::add(unsigned char const *new_buffer,
               size_t new_size) {
   if ((0 == new_size) || (NULL == new_buffer))
     return;
diff --git a/src/common/memory.h b/src/common/memory.h
index 0f5f3d5a6..35683600a 100644
--- a/src/common/memory.h
+++ b/src/common/memory.h
@@ -169,8 +169,8 @@ public:
   }
 
   void resize(size_t new_size) throw();
-  void add(unsigned char *new_buffer, size_t new_size);
-  void add(memory_cptr &new_buffer) {
+  void add(unsigned char const *new_buffer, size_t new_size);
+  void add(memory_cptr const &new_buffer) {
     add(new_buffer->get_buffer(), new_buffer->get_size());
   }