diff --git a/src/modules/bluetooth/module-bluetooth-device.c b/src/modules/bluetooth/module-bluetooth-device.c
index fadfa5403..96b95b4fc 100644
--- a/src/modules/bluetooth/module-bluetooth-device.c
+++ b/src/modules/bluetooth/module-bluetooth-device.c
@@ -462,7 +462,7 @@ static int setup_a2dp(struct userdata *u) {
         }
     }
 
-    pa_assert(i < PA_ELEMENTSOF(freq_table));
+    pa_assert((unsigned) i < PA_ELEMENTSOF(freq_table));
 
     if (cap->capability.configured)
         return 0;