diff --git a/sys/x86/iommu/busdma_dmar.c b/sys/x86/iommu/busdma_dmar.c
index df8799a4078..cada29d4143 100644
--- a/sys/x86/iommu/busdma_dmar.c
+++ b/sys/x86/iommu/busdma_dmar.c
@@ -341,6 +341,7 @@ dmar_bus_dmamap_load_something1(struct bus_dma_tag_dmar *tag,
 		segs = tag->segments;
 	ctx = tag->ctx;
 	seg = *segp;
+	error = 0;
 	idx = 0;
 	while (buflen > 0) {
 		seg++;