diff --git a/RELEASE_NOTES b/RELEASE_NOTES
index 8b9859ebd..1a82bf274 100644
--- a/RELEASE_NOTES
+++ b/RELEASE_NOTES
@@ -164,6 +164,7 @@ since ns-3.9, in many cases referencing the Bugzilla bug number
    - bug 1030 - routing/aodv example fixed
    - bug 1031 - Wifi hidden terminal example does not work
    - bug 1032 - Unable to specify multiple Compiler/Linker flags
+   - Fixed the UanPhyGen::IsStateBusy method, error with logical OR
 
 Known issues
 ------------
diff --git a/src/devices/uan/model/uan-phy-gen.cc b/src/devices/uan/model/uan-phy-gen.cc
index 5d6c8a9ab..2ac9bb2d2 100644
--- a/src/devices/uan/model/uan-phy-gen.cc
+++ b/src/devices/uan/model/uan-phy-gen.cc
@@ -708,7 +708,7 @@ UanPhyGen::IsStateIdle (void)
 bool
 UanPhyGen::IsStateBusy (void)
 {
-  return !IsStateIdle () || !IsStateSleep ();
+  return !IsStateIdle () && !IsStateSleep ();
 }
 bool
 UanPhyGen::IsStateRx (void)