diff --git a/hermit/drivers/net/mmnif.c b/hermit/drivers/net/mmnif.c
index a4c6ea331..4e4c6a4d8 100644
--- a/hermit/drivers/net/mmnif.c
+++ b/hermit/drivers/net/mmnif.c
@@ -594,7 +594,7 @@ err_t mmnif_init(struct netif *netif)
 
 	err = vma_add((size_t)header_start_address, (size_t)header_start_address + ((nodes * header_size) >> PAGE_BITS), VMA_READ|VMA_WRITE|VMA_CACHEABLE);
 	if (BUILTIN_EXPECT(err, 0)) {
-		DEBUGPRINTF("mmnif init(): vma_add failed\n");
+		DEBUGPRINTF("mmnif init(): vma_add failed for header_start_address %p\n", header_start_address);
 		goto out;
 	}
 
@@ -616,7 +616,7 @@ err_t mmnif_init(struct netif *netif)
 	err = vma_add((size_t)heap_start_address, (size_t)heap_start_address + ((nodes * heap_size) >> PAGE_BITS), VMA_READ|VMA_WRITE|VMA_CACHEABLE);
 	if (BUILTIN_EXPECT(!heap_start_address, 0))
 	{
-		DEBUGPRINTF("mmnif init(): vma_alloc failed\n");
+		DEBUGPRINTF("mmnif init(): vma_add failed for heap_start_address %p\n", heap_start_address);
 		goto out;
 	}