diff --git a/CHANGELOG.md b/CHANGELOG.md
index a2e67b7a..b166e321 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # OHHTTPStubs — CHANGELOG
 
 ## Master
+
+* Fixed `URLRequest.ohhttpStubs_httpBody` function in Swift 3 and 4.  
+  [@mplorentz](https://github.com/mplorentz)
 * Added absolute url matcher.  
   [@victorg1991](https://github.com/victorg1991)
   [#254](https://github.com/AliSoftware/OHHTTPStubs/pull/254)
diff --git a/OHHTTPStubs/Sources/Swift/OHHTTPStubsSwift.swift b/OHHTTPStubs/Sources/Swift/OHHTTPStubsSwift.swift
index 82c61888..e32df03c 100644
--- a/OHHTTPStubs/Sources/Swift/OHHTTPStubsSwift.swift
+++ b/OHHTTPStubs/Sources/Swift/OHHTTPStubsSwift.swift
@@ -58,6 +58,12 @@
       return rangeOfString(string) != nil
     }
   }
+#else
+  extension URLRequest {
+    public var ohhttpStubs_httpBody: Data? {
+      return (self as NSURLRequest).ohhttpStubs_HTTPBody()
+    }
+  }
 #endif
 
 
diff --git a/OHHTTPStubs/UnitTests/Test Suites/SwiftHelpersTests.swift b/OHHTTPStubs/UnitTests/Test Suites/SwiftHelpersTests.swift
index 74eeb6b8..3c366db4 100644
--- a/OHHTTPStubs/UnitTests/Test Suites/SwiftHelpersTests.swift	
+++ b/OHHTTPStubs/UnitTests/Test Suites/SwiftHelpersTests.swift	
@@ -439,6 +439,20 @@ class SwiftHelpersTests : XCTestCase {
 
     XCTAssertFalse(matchesHeader)
   }
+    
+  func test_ohhttpStubs_httpBody() {
+#if swift(>=3.0)
+    let data = "Hello world".data(using: .utf8)
+    var req = URLRequest(url: URL(string: "foo://bar")!)
+    req.httpBody = data
+    XCTAssertEqual(req.ohhttpStubs_httpBody, data)
+#else
+    let data = "Hello world".dataUsingEncoding(NSUTF8StringEncoding)
+    let req = NSMutableURLRequest(URL: NSURL(string: "foo://bar")!)
+    req.HTTPBody = data
+    XCTAssertEqual(req.OHHTTPStubs_HTTPBody(), data)
+#endif
+  }
 
   let sampleURLs = [
     // Absolute URLs