diff --git a/src/tingle/tingle.c b/src/tingle/tingle.c
index 11de326..8f4f043 100644
--- a/src/tingle/tingle.c
+++ b/src/tingle/tingle.c
@@ -532,7 +532,7 @@ _memory_usage_get(meminfo_t *memory)
 
    memory->cached += tmp_slab;
    memory->used = memory->total - tmp_free - memory->cached - memory->buffered;
-   memory->swap_used = memory->swap_total = swap_free;
+   memory->swap_used = memory->swap_total - swap_free;
 
    fclose(f);
 #elif defined(__FreeBSD__) || defined(__DragonFly__)