diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 4203144da9865efa61afc0df2fae12f8fd432728..12742b1433f82ffc2c482518eaa8671829dff851 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -346,12 +346,12 @@ static void amdvi_update_iotlb(AMDVIState *s, uint16_t devid,
                                uint64_t gpa, IOMMUTLBEntry to_cache,
                                uint16_t domid)
 {
-    AMDVIIOTLBEntry *entry = g_new(AMDVIIOTLBEntry, 1);
-    uint64_t *key = g_new(uint64_t, 1);
-    uint64_t gfn = gpa >> AMDVI_PAGE_SHIFT_4K;
-
     /* don't cache erroneous translations */
     if (to_cache.perm != IOMMU_NONE) {
+        AMDVIIOTLBEntry *entry = g_new(AMDVIIOTLBEntry, 1);
+        uint64_t *key = g_new(uint64_t, 1);
+        uint64_t gfn = gpa >> AMDVI_PAGE_SHIFT_4K;
+
         trace_amdvi_cache_update(domid, PCI_BUS_NUM(devid), PCI_SLOT(devid),
                 PCI_FUNC(devid), gpa, to_cache.translated_addr);