diff --git a/lmkd/lmkd.c b/lmkd/lmkd.c
index afc81ed..e404e44 100644
--- a/lmkd/lmkd.c
+++ b/lmkd/lmkd.c
@@ -109,7 +109,7 @@
 static struct proc *pidhash[PIDHASH_SZ];
 #define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))
 
-#define ADJTOSLOT(adj) (adj + -OOM_SCORE_ADJ_MIN)
+#define ADJTOSLOT(adj) ((adj) + -OOM_SCORE_ADJ_MIN)
 static struct adjslot_list procadjslot_list[ADJTOSLOT(OOM_SCORE_ADJ_MAX) + 1];
 
 /*