diff --git a/apps/darkroom-android/android/AndroidManifest.xml b/apps/darkroom-android/android/AndroidManifest.xml
index 45e42af..fd56ead 100644
--- a/apps/darkroom-android/android/AndroidManifest.xml
+++ b/apps/darkroom-android/android/AndroidManifest.xml
@@ -73,6 +73,14 @@
         android:requestLegacyExternalStorage="true"
         android:supportsRtl="true">
 
+        <!-- The DSP's RPC library, which QNN's Hexagon stub loads. From API 31
+             an app's linker namespace refuses a vendor library the manifest
+             does not name, and QNN then fails to create its device
+             (QNN_DEVICE_ERROR_INVALID_CONFIG) before it reaches the DSP:
+             every model ran on the CPU on 0.22.0. Not required, so a device
+             without one still installs and stays on the CPU. -->
+        <uses-native-library android:name="libcdsprpc.so" android:required="false" />
+
         <!-- NativeActivity rather than a Kotlin Activity: android-activity's
              glue loads libdarkroom.so and calls android_main. `android.app.lib_name`
              is how it learns which library to load, and must match [lib].name.
diff --git a/apps/darkroom-android/src/lib.rs b/apps/darkroom-android/src/lib.rs
index 6d89b05..fda94ea 100644
--- a/apps/darkroom-android/src/lib.rs
+++ b/apps/darkroom-android/src/lib.rs
@@ -538,6 +538,19 @@ mod tests {
         Some(value.to_string())
     }
 
+    /// From API 31 the linker refuses a vendor library the manifest does not
+    /// name, and QNN cannot create its Hexagon device without the DSP's RPC
+    /// library: 0.22.0 ran every model on the CPU for want of this line.
+    #[test]
+    fn the_npu_can_reach_the_dsp() {
+        assert!(
+            manifest().contains(
+                r#"<uses-native-library android:name="libcdsprpc.so" android:required="false" />"#
+            ),
+            "libcdsprpc.so must be declared, and not required"
+        );
+    }
+
     #[test]
     fn a_gallery_can_open_a_photograph_in_this_app() {
         let manifest = manifest();