diff --git a/codecs/max98357a/speaker.conf b/codecs/max98357a/speaker.conf
index 4847e43..6463f2b 100644
--- a/codecs/max98357a/speaker.conf
+++ b/codecs/max98357a/speaker.conf
@@ -3,7 +3,7 @@ If.custompcm {
                 Type String
                 Empty "$${var:max98357apcm}"
         }
-        False.Define.pcm ${var:max98357apcm}
+        False.Define.pcm "${var:max98357apcm}"
 	True.Define.pcm 0
 }
 
diff --git a/sof-rt5682/rt5682-headset.conf b/sof-rt5682/rt5682-headset.conf
index fa19eef..36b56a8 100644
--- a/sof-rt5682/rt5682-headset.conf
+++ b/sof-rt5682/rt5682-headset.conf
@@ -3,7 +3,7 @@ If.custompcm {
                 Type String
                 Empty "$${var:rt5682pcm}"
         }
-        False.Define.pcm ${var:rt5682pcm}
+        False.Define.pcm "${var:rt5682pcm}"
         True.Define.pcm 1
 }