diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
index f8eb384..729f283 100644
--- a/util/nvmutil/nvmutil.c
+++ b/util/nvmutil/nvmutil.c
@@ -441,7 +441,7 @@ swap(int partnum) /* swaps bytes in words, not pointers. */
 	size_t w, x;
 	uint8_t *n = (uint8_t *) gbe[partnum];
 
-	for (w = nf * ((uint8_t *) &e)[0], x = 1; w < NVM_SIZE;
+	for (w = NVM_SIZE * ((uint8_t *) &e)[0], x = 1; w < NVM_SIZE;
 	    w += 2, x += 2) {
 		n[w] ^= n[x];
 		n[x] ^= n[w];