diff --git a/smmapdfw/libsmmapdfw/htbuffer.c b/smmapdfw/libsmmapdfw/htbuffer.c
index 94d8a2f..42935d8 100644
--- a/smmapdfw/libsmmapdfw/htbuffer.c
+++ b/smmapdfw/libsmmapdfw/htbuffer.c
@@ -45,7 +45,6 @@ htbuffer_t *htbuffer_init(unsigned int start_size) {
     ? (start_size + (DEFAULT_CHUNK_SIZE - start_size % DEFAULT_CHUNK_SIZE)) 
     : start_size;
     
-  b->current_fill_size = 0;
   b->max_size = DEFAULT_MAX_SIZE;
 
   b->buf = (char*) htmalloc(sizeof(char) * b->current_buf_size);
@@ -65,9 +64,7 @@ void htbuffer_free(htbuffer_t *b) {
     
 
 unsigned int htbuffer_strlen(htbuffer_t *b) {
-  /* 1 because of the terminating \0 */
-  assert((b->current_fill_size + 1) == strlen(b->buf));
-  return b->current_fill_size - 1;
+  return strlen(b->buf);
 }
 
 htbuffer_t *htbuffer_memcpy_w_offset(htbuffer_t *dest, unsigned int offset, const char *src, unsigned int src_size) {
@@ -91,8 +88,6 @@ htbuffer_t *htbuffer_memcpy_w_offset(htbuffer_t *dest, unsigned int offset, cons
     dest->current_buf_size = new_buf_size;
   }
 
-  dest->current_fill_size = src_size + offset;
-
   memcpy(dest->buf + offset, src, src_size);
 
   return dest;
diff --git a/smmapdfw/libsmmapdfw/htbuffer.h b/smmapdfw/libsmmapdfw/htbuffer.h
index c454069..2ff90a6 100644
--- a/smmapdfw/libsmmapdfw/htbuffer.h
+++ b/smmapdfw/libsmmapdfw/htbuffer.h
@@ -29,7 +29,6 @@
 typedef struct htbuffer_s {
   char *buf;
   unsigned int current_buf_size;
-  unsigned int current_fill_size;
   unsigned int max_size;
 } htbuffer_t;