diff --git a/ewah/ewah_bitmap.c b/ewah/ewah_bitmap.c
index 9ced2da..fccb42b 100644
--- a/ewah/ewah_bitmap.c
+++ b/ewah/ewah_bitmap.c
@@ -41,7 +41,7 @@
 	self->alloc_size = new_size;
 	self->buffer = ewah_realloc(self->buffer,
 		self->alloc_size * sizeof(eword_t));
-	self->rlw = self->buffer + (rlw_offset / sizeof(size_t));
+	self->rlw = self->buffer + (rlw_offset / sizeof(eword_t));
 }
 
 static inline void buffer_push(struct ewah_bitmap *self, eword_t value)