diff --git a/Changelog.md b/Changelog.md
index ed5822902..e825360ce 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,4 +1,6 @@
 # Next
+### Fixed
+- Fixed a bug with missing Content-Type header when using `.requestJSONEncodable` [#1410](https://github.com/Moya/Moya/pull/1410) by [@Vict0rS](https://github.com/Vict0rS).
 
 # [10.0.0] - 2017-10-21
 ### Fixed
diff --git a/Sources/Moya/URLRequest+Encoding.swift b/Sources/Moya/URLRequest+Encoding.swift
index 74c84b78c..87302635b 100644
--- a/Sources/Moya/URLRequest+Encoding.swift
+++ b/Sources/Moya/URLRequest+Encoding.swift
@@ -6,6 +6,12 @@ internal extension URLRequest {
         do {
             let encodable = AnyEncodable(encodable)
             httpBody = try JSONEncoder().encode(encodable)
+
+            let contentTypeHeaderName = "Content-Type"
+            if value(forHTTPHeaderField: contentTypeHeaderName) == nil {
+                setValue("application/json", forHTTPHeaderField: contentTypeHeaderName)
+            }
+
             return self
         } catch {
             throw MoyaError.encodableMapping(error)
diff --git a/Tests/EndpointSpec.swift b/Tests/EndpointSpec.swift
index 1dd5ff50c..cfe579aec 100644
--- a/Tests/EndpointSpec.swift
+++ b/Tests/EndpointSpec.swift
@@ -162,9 +162,15 @@ final class EndpointSpec: QuickSpec {
                     expect(issue.title).to(equal(expectedIssue.title))
                 }
 
+                it("updates headers to include Content-Type: application/json") {
+                    let contentTypeHeaders = ["Content-Type": "application/json"]
+                    let initialHeaderFields = endpoint.httpHeaderFields ?? [:]
+                    let expectedHTTPHeaderFields = initialHeaderFields.merging(contentTypeHeaders) { initialValue, _ in initialValue }
+                    expect(request.allHTTPHeaderFields).to(equal(expectedHTTPHeaderFields))
+                }
+
                 it("doesn't update any of the other properties") {
                     expect(request.url?.absoluteString).to(equal(endpoint.url))
-                    expect(request.allHTTPHeaderFields).to(equal(endpoint.httpHeaderFields))
                     expect(request.httpMethod).to(equal(endpoint.method.rawValue))
                 }
             }