diff --git a/src/samplesrc/a2pwm/hilopwm.pla b/src/samplesrc/a2pwm/hilopwm.pla
index 015f750..866bc2e 100755
--- a/src/samplesrc/a2pwm/hilopwm.pla
+++ b/src/samplesrc/a2pwm/hilopwm.pla
@@ -333,7 +333,7 @@ def playback(idx)
                         fin
                         break
                     is $08 // <-
-                        if current.octave > 1
+                        if current.octave > 0
                             current.octave--
                         fin
                         break