--- a/src/MusicSrc/MusicDevice.c
+++ b/src/MusicSrc/MusicDevice.c
@@ -569,6 +569,14 @@
     // connected
     ndev->dev.isOpen = 1;
     ndev->dev.outputIndex = outputIndex;
+#else
+    // No native MIDI backend implemented for this platform (e.g. Android) -
+    // report failure so InitDecXMI()'s caller falls back to another device
+    // instead of treating an unopened device as successfully initialized.
+    (void)outputIndex;
+    (void)samplerate;
+    WARN("NativeMidiInit(): native MIDI is not implemented on this platform");
+    return -1;
 #endif
     // suppress compiler warnings
     (void)outputIndex;