diff --git a/Proton/PROBinding.m b/Proton/PROBinding.m
index 41a0b7c..6434f4e 100644
--- a/Proton/PROBinding.m
+++ b/Proton/PROBinding.m
@@ -59,11 +59,9 @@ @implementation PROBinding
 @synthesize boundKeyPath = m_boundKeyPath;
 @synthesize ownerObserver = m_ownerObserver;
 @synthesize boundObjectObserver = m_boundObjectObserver;
-@synthesize updating = m_updating;
 @synthesize boundValueTransformationBlock = m_boundValueTransformationBlock;
 @synthesize ownerValueTransformationBlock = m_ownerValueTransformationBlock;
 @synthesize validationFailedBlock = m_validationFailedBlock;
-@synthesize settingInitialValue = m_settingInitialValue;
 
 - (BOOL)isSettingInitialValue {
     return m_flags.settingInitialValue;