diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
index 2b8c67b9a1..0a5a60ca1e 100644
--- a/hw/arm/smmu-common.c
+++ b/hw/arm/smmu-common.c
@@ -249,7 +249,7 @@ SMMUTransTableInfo *select_tt(SMMUTransCfg *cfg, dma_addr_t iova)
         /* there is a ttbr0 region and we are in it (high bits all zero) */
         return &cfg->tt[0];
     } else if (cfg->tt[1].tsz &&
-           !extract64(iova, 64 - cfg->tt[1].tsz, cfg->tt[1].tsz - tbi_byte)) {
+        sextract64(iova, 64 - cfg->tt[1].tsz, cfg->tt[1].tsz - tbi_byte) == -1) {
         /* there is a ttbr1 region and we are in it (high bits all one) */
         return &cfg->tt[1];
     } else if (!cfg->tt[0].tsz) {