diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
index a14cdc434f..8cd9dba9ac 100644
--- a/hw/ppc/spapr_iommu.c
+++ b/hw/ppc/spapr_iommu.c
@@ -41,7 +41,7 @@ enum sPAPRTCEAccess {
 
 static QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
 
-sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
+sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn)
 {
     sPAPRTCETable *tcet;
 
@@ -52,7 +52,7 @@ sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
     }
 
     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
-        if (tcet->liobn == liobn) {
+        if (tcet->liobn == (uint32_t)liobn) {
             return tcet;
         }
     }
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 7d9ab9d16c..317feb68a0 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -511,7 +511,7 @@ struct sPAPRTCETable {
     QLIST_ENTRY(sPAPRTCETable) list;
 };
 
-sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn);
+sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn);
 void spapr_events_init(sPAPREnvironment *spapr);
 void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq);
 int spapr_h_cas_compose_response(target_ulong addr, target_ulong size);