diff --git a/Code/ObjectMapping/RKMappingOperation.m b/Code/ObjectMapping/RKMappingOperation.m
index 7d20bc19c6..8e5b4a9cbc 100644
--- a/Code/ObjectMapping/RKMappingOperation.m
+++ b/Code/ObjectMapping/RKMappingOperation.m
@@ -373,27 +373,11 @@ - (BOOL)applyAttributeMappings:(NSArray *)attributeMappings
             continue;
         }
 
-        if (self.objectMapping.ignoreUnknownKeyPaths && ![self.sourceObject respondsToSelector:NSSelectorFromString(attributeMapping.sourceKeyPath)]) {
-            RKLogDebug(@"Source object is not key-value coding compliant for the keyPath '%@', skipping...", attributeMapping.sourceKeyPath);
-            continue;
-        }
-
         id value = nil;
-        @try {
-            if ([attributeMapping.sourceKeyPath isEqualToString:@""]) {
-                value = self.sourceObject;
-            } else {
-                value = [self.sourceObject valueForKeyPath:attributeMapping.sourceKeyPath];
-            }
-        }
-        @catch (NSException *exception) {
-            if ([[exception name] isEqualToString:NSUndefinedKeyException] && self.objectMapping.ignoreUnknownKeyPaths) {
-                RKLogWarning(@"Encountered an undefined attribute mapping for keyPath '%@' that generated NSUndefinedKeyException exception. Skipping due to objectMapping.ignoreUnknownKeyPaths = YES",
-                           attributeMapping.sourceKeyPath);
-                continue;
-            }
-
-            @throw;
+        if ([attributeMapping.sourceKeyPath isEqualToString:@""]) {
+            value = self.sourceObject;
+        } else {
+            value = [self.sourceObject valueForKeyPath:attributeMapping.sourceKeyPath];
         }
 
         if (value) {
@@ -540,19 +524,7 @@ - (BOOL)applyRelationshipMappings
     for (RKRelationshipMapping *relationshipMapping in [self relationshipMappings]) {
         if ([self isCancelled]) return NO;
         
-        id value = nil;
-        @try {
-            value = [self.sourceObject valueForKeyPath:relationshipMapping.sourceKeyPath];
-        }
-        @catch (NSException *exception) {
-            if ([[exception name] isEqualToString:NSUndefinedKeyException] && self.objectMapping.ignoreUnknownKeyPaths) {
-                RKLogWarning(@"Encountered an undefined relationship mapping for keyPath '%@' that generated NSUndefinedKeyException exception. Skipping due to objectMapping.ignoreUnknownKeyPaths = YES",
-                             relationshipMapping.sourceKeyPath);
-                continue;
-            }
-
-            @throw;
-        }
+        id value = [self.sourceObject valueForKeyPath:relationshipMapping.sourceKeyPath];
 
         // Track that we applied this mapping
         [mappingsApplied addObject:relationshipMapping];
diff --git a/Code/ObjectMapping/RKObjectMapping.h b/Code/ObjectMapping/RKObjectMapping.h
index f4de77620b..eb2fc41f8e 100644
--- a/Code/ObjectMapping/RKObjectMapping.h
+++ b/Code/ObjectMapping/RKObjectMapping.h
@@ -265,15 +265,6 @@
  */
 @property (nonatomic, assign) BOOL performKeyValueValidation;
 
-/**
- When `YES`, the mapping operation will check that the object being mapped is key-value coding compliant for the mapped key. If it is not, the attribute/relationship mapping will be ignored and mapping will continue. When `NO`, property mappings for unknown key paths will trigger `NSUnknownKeyException` exceptions for the unknown keyPath.
-
- Defaults to `NO` to help the developer catch incorrect mapping configurations during development.
-
- **Default**: `NO`
- */
-@property (nonatomic, assign) BOOL ignoreUnknownKeyPaths;
-
 /**
  Returns the default value to be assigned to the specified attribute when it is missing from a mappable payload.
 
diff --git a/Code/ObjectMapping/RKObjectMapping.m b/Code/ObjectMapping/RKObjectMapping.m
index 39d0c11401..8296dc8e4a 100644
--- a/Code/ObjectMapping/RKObjectMapping.m
+++ b/Code/ObjectMapping/RKObjectMapping.m
@@ -83,7 +83,6 @@ - (id)initWithClass:(Class)objectClass
         self.setNilForMissingRelationships = NO;
         self.forceCollectionMapping = NO;
         self.performKeyValueValidation = YES;
-        self.ignoreUnknownKeyPaths = NO;
         self.sourceToDestinationKeyTransformationBlock = defaultSourceToDestinationKeyTransformationBlock;
     }
 
diff --git a/Tests/Logic/ObjectMapping/RKMappingOperationTest.m b/Tests/Logic/ObjectMapping/RKMappingOperationTest.m
index b059e9941f..c8a4dac13f 100644
--- a/Tests/Logic/ObjectMapping/RKMappingOperationTest.m
+++ b/Tests/Logic/ObjectMapping/RKMappingOperationTest.m
@@ -388,87 +388,6 @@ - (void)testShouldMapADateToAStringUsingThePreferredDateFormatter
     assertThat(newObject.boolString, is(equalTo(@"11-27-1982")));
 }
 
-- (void)testShouldGenerateAnUnknownKeyPathExceptionWhenIgnoreUnknownKeyPathsIsNO
-{
-    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
-    [mapping addAttributeMappingsFromArray:@[@"invalid", @"boolString"]];
-    mapping.ignoreUnknownKeyPaths = NO;
-    TestMappable *object = [[TestMappable alloc] init];
-    object.boolString = @"test";
-    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
-    RKMappingOperation *operation = [[RKMappingOperation alloc] initWithSourceObject:object destinationObject:dictionary mapping:mapping];
-    RKObjectMappingOperationDataSource *dataSource = [RKObjectMappingOperationDataSource new];
-    operation.dataSource = dataSource;
-    NSError *error = nil;
-    BOOL success;
-    NSException *exception = nil;
-    @try {
-        success = [operation performMapping:&error];
-    }
-    @catch (NSException *e) {
-        exception = e;
-    }
-    @finally {
-        assertThat(exception, isNot(nilValue()));
-        operation = nil;
-    }
-}
-
-- (void)testShouldOptionallyIgnoreUnknownKeyPathAttributes
-{
-    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
-    [mapping addAttributeMappingsFromArray:@[@"invalid", @"boolString"]];
-    mapping.ignoreUnknownKeyPaths = YES;
-    TestMappable *object = [[TestMappable alloc] init];
-    object.boolString = @"test";
-    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
-    RKMappingOperation *operation = [[RKMappingOperation alloc] initWithSourceObject:object destinationObject:dictionary mapping:mapping];
-    RKObjectMappingOperationDataSource *dataSource = [RKObjectMappingOperationDataSource new];
-    operation.dataSource = dataSource;
-    NSError *error = nil;
-    BOOL success;
-    NSException *exception = nil;
-    @try {
-        success = [operation performMapping:&error];
-    }
-    @catch (NSException *e) {
-        exception = e;
-    }
-    @finally {
-        assertThat(exception, is(nilValue()));
-        assertThatBool(success, is(equalToBool(YES)));
-        operation = nil;
-    }
-}
-
-- (void)testShouldOptionallyIgnoreUnknownKeyPathRelationships
-{
-    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
-    [mapping addAttributeMappingsFromArray:@[@"boolString"]];
-    [mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"invalid" toKeyPath:@"invalid" withMapping:[RKObjectMapping mappingForClass:[TestMappable class]]]];
-    mapping.ignoreUnknownKeyPaths = YES;
-    TestMappable *object = [[TestMappable alloc] init];
-    object.boolString = @"test";
-    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
-    RKMappingOperation *operation = [[RKMappingOperation alloc] initWithSourceObject:object destinationObject:dictionary mapping:mapping];
-    RKObjectMappingOperationDataSource *dataSource = [RKObjectMappingOperationDataSource new];
-    operation.dataSource = dataSource;
-    NSError *error = nil;
-    BOOL success;
-    NSException *exception = nil;
-    @try {
-        success = [operation performMapping:&error];
-    }
-    @catch (NSException *e) {
-        exception = e;
-    }
-    @finally {
-        assertThat(exception, is(nilValue()));
-        assertThatBool(success, is(equalToBool(YES)));
-        operation = nil;
-    }
-}
-
 - (void)testShouldLogADebugMessageIfTheRelationshipMappingTargetsAnArrayOfArrays
 {
     // Create a dictionary with a dictionary containing an array