diff --git a/usr.bin/bsdiff/bsdiff/bsdiff.c b/usr.bin/bsdiff/bsdiff/bsdiff.c
index 005ad4d16610..8b764da1de94 100644
--- a/usr.bin/bsdiff/bsdiff/bsdiff.c
+++ b/usr.bin/bsdiff/bsdiff/bsdiff.c
@@ -272,7 +272,7 @@ int main(int argc,char *argv[])
 	/* Compute the differences, writing ctrl as we go */
 	if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
 		errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
-	scan=0;len=0;
+	scan=0;len=0;pos=0;
 	lastscan=0;lastpos=0;lastoffset=0;
 	while(scan<newsize) {
 		oldscore=0;