diff --git a/framework/api/current.txt b/framework/api/current.txt
index a080149..323c533 100644
--- a/framework/api/current.txt
+++ b/framework/api/current.txt
@@ -244,7 +244,7 @@
     field public static final int HEADER_COMPRESSION_6LOWPAN = 2; // 0x2
     field public static final int HEADER_COMPRESSION_ANY = 0; // 0x0
     field public static final int HEADER_COMPRESSION_NONE = 1; // 0x1
-    field public static final int PSM_ANY = -1; // 0xffffffff
+    field public static final int PSM_ANY = 0; // 0x0
     field public static final int ROLE_ANY = 0; // 0x0
     field public static final int ROLE_CLIENT = 1; // 0x1
     field public static final int ROLE_SERVER = 2; // 0x2
@@ -254,7 +254,7 @@
     ctor public L2capNetworkSpecifier.Builder();
     method @NonNull public android.net.L2capNetworkSpecifier build();
     method @NonNull public android.net.L2capNetworkSpecifier.Builder setHeaderCompression(int);
-    method @NonNull public android.net.L2capNetworkSpecifier.Builder setPsm(int);
+    method @NonNull public android.net.L2capNetworkSpecifier.Builder setPsm(@IntRange(from=0, to=255) int);
     method @NonNull public android.net.L2capNetworkSpecifier.Builder setRemoteAddress(@Nullable android.net.MacAddress);
     method @NonNull public android.net.L2capNetworkSpecifier.Builder setRole(int);
   }
diff --git a/framework/src/android/net/L2capNetworkSpecifier.java b/framework/src/android/net/L2capNetworkSpecifier.java
index 0d46a3e..6770add 100644
--- a/framework/src/android/net/L2capNetworkSpecifier.java
+++ b/framework/src/android/net/L2capNetworkSpecifier.java
@@ -18,6 +18,7 @@
 
 import android.annotation.FlaggedApi;
 import android.annotation.IntDef;
+import android.annotation.IntRange;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.os.Build;
@@ -31,7 +32,7 @@
 import java.util.Objects;
 
 /**
- * A {@link NetworkSpecifier} used to identify an L2CAP network.
+ * A {@link NetworkSpecifier} used to identify an L2CAP network over BLE.
  *
  * An L2CAP network is not symmetrical, meaning there exists both a server (Bluetooth peripheral)
  * and a client (Bluetooth central) node. This specifier contains the information required to
@@ -119,7 +120,7 @@
      * This PSM value is only meaningful in {@link NetworkRequest}s. Specifiers for actual L2CAP
      * networks never have this value set.
      */
-    public static final int PSM_ANY = -1;
+    public static final int PSM_ANY = 0;
 
     /** The Bluetooth L2CAP Protocol/Service Multiplexer (PSM). */
     private final int mPsm;
@@ -228,7 +229,10 @@
          * @param psm the Protocol/Service Multiplexer (PSM) to connect to.
          */
         @NonNull
-        public Builder setPsm(int psm) {
+        public Builder setPsm(@IntRange(from = 0, to = 255) int psm) {
+            if (psm < 0 /* PSM_ANY */ || psm > 0xFF) {
+                throw new IllegalArgumentException("PSM must be PSM_ANY or within range [1, 255]");
+            }
             mPsm = psm;
             return this;
         }