diff --git a/bin/cheribsdtest/cheribsdtest_vm.c b/bin/cheribsdtest/cheribsdtest_vm.c
index d0ec78392d46..9bd39fde6af9 100644
--- a/bin/cheribsdtest/cheribsdtest_vm.c
+++ b/bin/cheribsdtest/cheribsdtest_vm.c
@@ -900,12 +900,6 @@ CHERIBSDTEST(vm_reservation_align,
 	    "mmap failed to align representable region with requested "
 	    "cheri alignment for %p", map);
 
-	map = CHERIBSDTEST_CHECK_SYSCALL(mmap(NULL, len,
-	    PROT_READ | PROT_WRITE, MAP_ANON | MAP_ALIGNED_CHERI_SEAL, -1, 0));
-	CHERIBSDTEST_VERIFY2(((ptraddr_t)(map) & align_mask) == 0,
-	    "mmap failed to align representable region with requested "
-	    "cheri seal alignment for %p", map);
-
 	cheribsdtest_success();
 }
 
diff --git a/lib/libsys/mmap.2 b/lib/libsys/mmap.2
index d9b4c4dc4d4a..b59e77eb3ce9 100644
--- a/lib/libsys/mmap.2
+++ b/lib/libsys/mmap.2
@@ -215,19 +215,6 @@ On architectures without CHERI support or where all capabilities are
 precise,
 .Dv MAP_ALIGNED_CHERI
 has no effect.
-.It Dv MAP_ALIGNED_CHERI_SEAL
-Align the region as required to allow a CHERI capability to be sealed.
-If a suitable region cannot be found or the address of
-.Fa addr
-or the length in
-.Fa len
-is not representable as a precise, sealable capability,
-.Fn mmap
-will fail.
-On architectures without CHERI support or where all capabilities are
-precise,
-.Dv MAP_ALIGNED_CHERI_SEAL
-has no effect.
 .It Dv MAP_ALIGNED_SUPER
 Align the region to maximize the potential use of large
 .Pq Dq super
@@ -608,8 +595,6 @@ was not.
 .It Bq Er EINVAL
 .Dv MAP_ALIGNED_CHERI
 (implied on CheriABI)
-or
-.Dv MAP_ALIGNED_CHERI_SEAL
 was specified and
 .Fa addr
 or
diff --git a/sys/sys/mman.h b/sys/sys/mman.h
index 80cff6690224..a52e0f525d8c 100644
--- a/sys/sys/mman.h
+++ b/sys/sys/mman.h
@@ -125,12 +125,8 @@
  *
  * MAP_ALIGNED_CHERI returns memory aligned appropriately for the requested
  * length or fails.  Passing an under-rounded length fails.
- *
- * MAP_ALIGNED_CHERI_SEAL returns memory aligned to allow sealing given the
- * requested length or fails.  Passing an under-rounded length fails.
  */
 #define	MAP_ALIGNED_CHERI	MAP_ALIGNED(2)	/* align for CHERI data */
-#define	MAP_ALIGNED_CHERI_SEAL	MAP_ALIGNED(3)	/* align for sealing on CHERI */
 
 /*
  * Flags provided to shm_rename
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index e87e5036b33f..00b3e1e14191 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -408,8 +408,8 @@ sys_mmap(struct thread *td, struct mmap_args *uap)
 #endif
 	}
 	else if ((flags & MAP_ALIGNMENT_MASK) != MAP_ALIGNED(0) &&
-		 (flags & MAP_ALIGNMENT_MASK) != MAP_ALIGNED_CHERI &&
-		 (flags & MAP_ALIGNMENT_MASK) != MAP_ALIGNED_CHERI_SEAL) {
+	    (flags & MAP_ALIGNMENT_MASK) != MAP_ALIGNED(3) && /* MAP_ALIGNED_CHERI_SEAL */
+	    (flags & MAP_ALIGNMENT_MASK) != MAP_ALIGNED_CHERI) {
 		/* Reject nonsensical sub-page alignment requests */
 		if ((flags >> MAP_ALIGNMENT_SHIFT) < PAGE_SHIFT) {
 			SYSERRCAUSE("subpage alignment request");
@@ -629,22 +629,17 @@ kern_mmap(struct thread *td, const struct mmap_req *mrp)
 	align = flags & MAP_ALIGNMENT_MASK;
 #if !__has_feature(capabilities)
 	/* In the non-CHERI case, remove the alignment request. */
-	if (align == MAP_ALIGNED_CHERI || align == MAP_ALIGNED_CHERI_SEAL) {
+	if (align == MAP_ALIGNED_CHERI) {
 		flags &= ~MAP_ALIGNMENT_MASK;
 		align = 0;
 	}
 #else /* __has_feature(capabilities) */
 	/*
-	 * Convert MAP_ALIGNED_CHERI(_SEAL) into explicit alignment
+	 * Convert MAP_ALIGNED_CHERI into explicit alignment
 	 * requests and pad lengths.  The combination of alignment (via
 	 * the updated, explicit alignment flags) and padding is required
 	 * for any request that would otherwise be unrepresentable due
 	 * to compressed capability bounds.
-	 *
-	 * XXX: With CHERI Concentrate, there is no difference in
-	 * precision between sealed and unsealed capabilities.  We
-	 * retain the duplicate code paths in case other otype tradeoffs
-	 * are made at a later date.
 	 */
 	if (align == MAP_ALIGNED_CHERI) {
 		flags &= ~MAP_ALIGNMENT_MASK;
@@ -658,18 +653,6 @@ kern_mmap(struct thread *td, const struct mmap_req *mrp)
 				addr_mask = CHERI_ALIGN_MASK(size);
 		}
 		align = flags & MAP_ALIGNMENT_MASK;
-	} else if (align == MAP_ALIGNED_CHERI_SEAL) {
-		flags &= ~MAP_ALIGNMENT_MASK;
-		if (CHERI_SEALABLE_ALIGNMENT(size) > (1UL << PAGE_SHIFT)) {
-			flags |= MAP_ALIGNED(CHERI_SEAL_ALIGN_SHIFT(size));
-
-			if (size != CHERI_SEALABLE_LENGTH(size))
-				size = CHERI_SEALABLE_LENGTH(size);
-
-			if (CHERI_SEAL_ALIGN_MASK(size) != 0)
-				addr_mask = CHERI_SEAL_ALIGN_MASK(size);
-		}
-		align = flags & MAP_ALIGNMENT_MASK;
 	}
 #endif