diff --git a/usr.sbin/makefs/makefs.8 b/usr.sbin/makefs/makefs.8
--- a/usr.sbin/makefs/makefs.8
+++ b/usr.sbin/makefs/makefs.8
@@ -33,7 +33,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd January 2, 2024
+.Dd January 19, 2024
 
 .Dt MAKEFS 8
 .Os
@@ -110,6 +110,8 @@
 indicates a percentage of the calculated image size.
 .It Fl D
 Treat duplicate paths in an mtree manifest as warnings not error.
+If this flag is specified more than once, warnings about duplicate paths
+are not printed at all.
 .It Fl d Ar debug-mask
 Enable various levels of debugging, depending upon which bits are
 set in
diff --git a/usr.sbin/makefs/makefs.c b/usr.sbin/makefs/makefs.c
--- a/usr.sbin/makefs/makefs.c
+++ b/usr.sbin/makefs/makefs.c
@@ -164,7 +164,7 @@
 			break;
 
 		case 'D':
-			dupsok = 1;
+			dupsok++;
 			break;
 
 		case 'd':
diff --git a/usr.sbin/makefs/mtree.c b/usr.sbin/makefs/mtree.c
--- a/usr.sbin/makefs/mtree.c
+++ b/usr.sbin/makefs/mtree.c
@@ -894,11 +894,11 @@
 
 		if (strcmp(name, node->name) == 0) {
 			if (def == true) {
-				if (!dupsok)
+				if (dupsok == 0)
 					mtree_error(
 					    "duplicate definition of %s",
 					    name);
-				else
+				else if (dupsok == 1)
 					mtree_warning(
 					    "duplicate definition of %s",
 					    name);