diff --git a/OptimizelySDKCore/OptimizelySDKCore/OPTLYEventBuilder.m b/OptimizelySDKCore/OptimizelySDKCore/OPTLYEventBuilder.m
index 381f325a4..c49d60fd6 100644
--- a/OptimizelySDKCore/OptimizelySDKCore/OPTLYEventBuilder.m
+++ b/OptimizelySDKCore/OptimizelySDKCore/OPTLYEventBuilder.m
@@ -262,7 +262,7 @@ - (NSDictionary *)createCommonParams:(OPTLYProjectConfig *)config userId:(NSStri
     params[OPTLYEventParameterKeysClientEngine] = [OPTLYEventBuilderDefault stringOrEmpty:[config clientEngine]];
     params[OPTLYEventParameterKeysClientVersion] = [OPTLYEventBuilderDefault stringOrEmpty:[config clientVersion]];
     params[OPTLYEventParameterKeysRevision] = [OPTLYEventBuilderDefault stringOrEmpty:config.revision];
-    params[OPTLYEventParameterKeysAnonymizeIP] = config.anonymizeIP ? @YES : @NO;
+    params[OPTLYEventParameterKeysAnonymizeIP] = [config.anonymizeIP boolValue] ? @YES : @NO;
     
     return [params copy];
 }
diff --git a/OptimizelySDKCore/OptimizelySDKCore/OPTLYProjectConfig.h b/OptimizelySDKCore/OptimizelySDKCore/OPTLYProjectConfig.h
index efe5279d8..268b1cd94 100644
--- a/OptimizelySDKCore/OptimizelySDKCore/OPTLYProjectConfig.h
+++ b/OptimizelySDKCore/OptimizelySDKCore/OPTLYProjectConfig.h
@@ -45,7 +45,7 @@ NS_ASSUME_NONNULL_END
 /// Datafile Revision number
 @property (nonatomic, strong, nonnull) NSString *revision;
 /// Flag for IP anonymization
-@property (nonatomic, assign) BOOL anonymizeIP;
+@property (nonatomic, assign) NSNumber<Optional> *anonymizeIP;
 /// List of Optimizely Experiment objects
 @property (nonatomic, strong, nonnull) NSArray<OPTLYExperiment> *experiments;
 /// List of Optimizely Event Type objects
diff --git a/OptimizelySDKCore/OptimizelySDKCoreTests/OPTLYProjectConfigTest.m b/OptimizelySDKCore/OptimizelySDKCoreTests/OPTLYProjectConfigTest.m
index f8512b730..5628e2c6b 100644
--- a/OptimizelySDKCore/OptimizelySDKCoreTests/OPTLYProjectConfigTest.m
+++ b/OptimizelySDKCore/OptimizelySDKCoreTests/OPTLYProjectConfigTest.m
@@ -153,7 +153,7 @@ - (void)testInitWithAnonymizeIPFalse {
     NSData *datafile = [OPTLYTestHelper loadJSONDatafileIntoDataObject:kDatafileNameAnonymizeIPFalse];
     OPTLYProjectConfig *projectConfig = [[OPTLYProjectConfig alloc] initWithDatafile:datafile];
     
-    XCTAssertFalse(projectConfig.anonymizeIP, @"IP anonymization should be set to false.");
+    XCTAssertFalse([projectConfig.anonymizeIP boolValue], @"IP anonymization should be set to false.");
 }
 
 #pragma mark - Test getExperimentForKey: