diff --git a/libc-test/semver/netbsd.txt b/libc-test/semver/netbsd.txt
index 174396c7202d3..ea2dd956e1af8 100644
--- a/libc-test/semver/netbsd.txt
+++ b/libc-test/semver/netbsd.txt
@@ -628,6 +628,7 @@ MADV_NORMAL
 MADV_RANDOM
 MADV_SEQUENTIAL
 MADV_WILLNEED
+MAP_ALIGNED
 MAP_ALIGNMENT_16MB
 MAP_ALIGNMENT_1TB
 MAP_ALIGNMENT_256TB
diff --git a/src/unix/bsd/netbsdlike/netbsd/mod.rs b/src/unix/bsd/netbsdlike/netbsd/mod.rs
index 87132e2587a92..549af2b3fdd08 100644
--- a/src/unix/bsd/netbsdlike/netbsd/mod.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/mod.rs
@@ -1663,13 +1663,13 @@ pub const MAP_WIRED: ::c_int = 0x800;
 pub const MAP_STACK: ::c_int = 0x2000;
 // map alignment aliases for MAP_ALIGNED
 pub const MAP_ALIGNMENT_SHIFT: ::c_int = 24;
-pub const MAP_ALIGNMENT_MASK: ::c_int = 0xff << MAP_ALIGNMENT_SHIFT;
-pub const MAP_ALIGNMENT_64KB: ::c_int = 16 << MAP_ALIGNMENT_SHIFT;
-pub const MAP_ALIGNMENT_16MB: ::c_int = 24 << MAP_ALIGNMENT_SHIFT;
-pub const MAP_ALIGNMENT_4GB: ::c_int = 32 << MAP_ALIGNMENT_SHIFT;
-pub const MAP_ALIGNMENT_1TB: ::c_int = 40 << MAP_ALIGNMENT_SHIFT;
-pub const MAP_ALIGNMENT_256TB: ::c_int = 48 << MAP_ALIGNMENT_SHIFT;
-pub const MAP_ALIGNMENT_64PB: ::c_int = 56 << MAP_ALIGNMENT_SHIFT;
+pub const MAP_ALIGNMENT_MASK: ::c_int = MAP_ALIGNED(0xff);
+pub const MAP_ALIGNMENT_64KB: ::c_int = MAP_ALIGNED(16);
+pub const MAP_ALIGNMENT_16MB: ::c_int = MAP_ALIGNED(24);
+pub const MAP_ALIGNMENT_4GB: ::c_int = MAP_ALIGNED(32);
+pub const MAP_ALIGNMENT_1TB: ::c_int = MAP_ALIGNED(40);
+pub const MAP_ALIGNMENT_256TB: ::c_int = MAP_ALIGNED(48);
+pub const MAP_ALIGNMENT_64PB: ::c_int = MAP_ALIGNED(56);
 // mremap flag
 pub const MAP_REMAPDUP: ::c_int = 0x004;
 
@@ -2467,6 +2467,10 @@ safe_f! {
         dev |= minor & 0xff;
         dev
     }
+
+    pub {const} fn MAP_ALIGNED(alignment: ::c_int) -> ::c_int {
+        alignment << MAP_ALIGNMENT_SHIFT
+    }
 }
 
 extern "C" {