diff --git a/media/libaudioclient/AudioPolicy.cpp b/media/libaudioclient/AudioPolicy.cpp
index 3dbaffd..4d2b6b1 100644
--- a/media/libaudioclient/AudioPolicy.cpp
+++ b/media/libaudioclient/AudioPolicy.cpp
@@ -71,6 +71,10 @@
     return NO_ERROR;
 }
 
+bool AudioMixMatchCriterion::isExcludeCriterion() const {
+    return mRule & RULE_EXCLUSION_MASK;
+}
+
 //
 //  AudioMix implementation
 //