diff --git a/OHHTTPStubs/Sources/OHHTTPStubsResponse.m b/OHHTTPStubs/Sources/OHHTTPStubsResponse.m
index 6963cbe3..2af695ea 100644
--- a/OHHTTPStubs/Sources/OHHTTPStubsResponse.m
+++ b/OHHTTPStubs/Sources/OHHTTPStubsResponse.m
@@ -88,14 +88,14 @@ +(instancetype)responseWithError:(NSError*)error
 
 -(instancetype)responseTime:(NSTimeInterval)responseTime
 {
-    self.responseTime = responseTime;
+    _responseTime = responseTime;
     return self;
 }
 
 -(instancetype)requestTime:(NSTimeInterval)requestTime responseTime:(NSTimeInterval)responseTime
 {
-    self.requestTime = requestTime;
-    self.responseTime = responseTime;
+    _requestTime = requestTime;
+    _responseTime = responseTime;
     return self;
 }
 
@@ -110,16 +110,16 @@ -(instancetype)initWithInputStream:(NSInputStream*)inputStream
     self = [super init];
     if (self)
     {
-        self.inputStream = inputStream;
-        self.dataSize = dataSize;
-        self.statusCode = statusCode;
+        _inputStream = inputStream;
+        _dataSize = dataSize;
+        _statusCode = statusCode;
         NSMutableDictionary * headers = [NSMutableDictionary dictionaryWithDictionary:httpHeaders];
         static NSString *const ContentLengthHeader = @"Content-Length";
         if (!headers[ContentLengthHeader])
         {
-            headers[ContentLengthHeader] = [NSString stringWithFormat:@"%llu",self.dataSize];
+            headers[ContentLengthHeader] = [NSString stringWithFormat:@"%llu",_dataSize];
         }
-        self.httpHeaders = [NSDictionary dictionaryWithDictionary:headers];
+        _httpHeaders = [NSDictionary dictionaryWithDictionary:headers];
     }
     return self;
 }
@@ -154,7 +154,7 @@ -(instancetype)initWithError:(NSError*)error
 {
     self = [super init];
     if (self) {
-        self.error = error;
+        _error = error;
     }
     return self;
 }