diff --git a/ewah/ewah_io.c b/ewah/ewah_io.c
index 61f6a43579..f73210973f 100644
--- a/ewah/ewah_io.c
+++ b/ewah/ewah_io.c
@@ -142,8 +142,8 @@ int ewah_read_mmap(struct ewah_bitmap *self, const void *map, size_t len)
 	 * the endianness conversion in a separate pass to ensure
 	 * we're loading 8-byte aligned words.
 	 */
-	memcpy(self->buffer, ptr, self->buffer_size * sizeof(uint64_t));
-	ptr += self->buffer_size * sizeof(uint64_t);
+	memcpy(self->buffer, ptr, self->buffer_size * sizeof(eword_t));
+	ptr += self->buffer_size * sizeof(eword_t);
 
 	for (i = 0; i < self->buffer_size; ++i)
 		self->buffer[i] = ntohll(self->buffer[i]);