diff --git a/EasyMapping/EKMapper.m b/EasyMapping/EKMapper.m
index d746f20..8766099 100644
--- a/EasyMapping/EKMapper.m
+++ b/EasyMapping/EKMapper.m
@@ -31,7 +31,6 @@ @implementation EKMapper
 
 + (id)objectFromExternalRepresentation:(NSDictionary *)externalRepresentation withMapping:(EKObjectMapping *)mapping
 {
-    NSParameterAssert([externalRepresentation isKindOfClass:[NSDictionary class]]);
     NSParameterAssert([mapping isKindOfClass:[EKObjectMapping class]]);
     
     if (![externalRepresentation isKindOfClass:[NSDictionary class]] ||
@@ -82,7 +81,6 @@ + (id)fillObject:(id)object fromExternalRepresentation:(NSDictionary *)externalR
 + (NSArray *)arrayOfObjectsFromExternalRepresentation:(NSArray *)externalRepresentation
                                           withMapping:(EKObjectMapping *)mapping
 {
-    NSParameterAssert([externalRepresentation isKindOfClass:[NSArray class]]);
     NSParameterAssert([mapping isKindOfClass:[EKObjectMapping class]]);
     
     if (![externalRepresentation isKindOfClass:[NSArray class]] ||