diff --git a/src/quicklist.c b/src/quicklist.c
index ae183ffd8..52e3988f5 100644
--- a/src/quicklist.c
+++ b/src/quicklist.c
@@ -110,7 +110,7 @@ quicklist *quicklistCreate(void) {
     return quicklist;
 }
 
-#define COMPRESS_MAX (1 << QL_COMP_BITS)
+#define COMPRESS_MAX ((1 << QL_COMP_BITS)-1)
 void quicklistSetCompressDepth(quicklist *quicklist, int compress) {
     if (compress > COMPRESS_MAX) {
         compress = COMPRESS_MAX;
@@ -120,7 +120,7 @@ void quicklistSetCompressDepth(quicklist *quicklist, int compress) {
     quicklist->compress = compress;
 }
 
-#define FILL_MAX (1 << (QL_FILL_BITS-1))
+#define FILL_MAX ((1 << (QL_FILL_BITS-1))-1)
 void quicklistSetFill(quicklist *quicklist, int fill) {
     if (fill > FILL_MAX) {
         fill = FILL_MAX;