diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a72ecd27..e2c1541a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 - Fixed responses from silently failing to parse when missing a `description`, which is now an optional property that defaults to an empty string #193
 - Add missing custom model protocol name #191
 - Fixed missing customization of JSONEncoder instance to encode request's body #147
+- Fixed string uploads #161
 
 ## 4.2.0
 
diff --git a/Specs/Petstore/generated/Swift/Sources/APIClient.swift b/Specs/Petstore/generated/Swift/Sources/APIClient.swift
index 76bb0c0ec..20e2c5d79 100644
--- a/Specs/Petstore/generated/Swift/Sources/APIClient.swift
+++ b/Specs/Petstore/generated/Swift/Sources/APIClient.swift
@@ -114,6 +114,8 @@ public class APIClient {
                             multipartFormData.append(url, withName: name)
                         } else if let data = value as? Data {
                             multipartFormData.append(data, withName: name)
+                        } else if let string = value as? String {
+                            multipartFormData.append(Data(string.utf8), withName: name)
                         }
                     }
                 },
diff --git a/Specs/PetstoreTest/generated/Swift/Sources/APIClient.swift b/Specs/PetstoreTest/generated/Swift/Sources/APIClient.swift
index a69a24753..dc6d39c55 100644
--- a/Specs/PetstoreTest/generated/Swift/Sources/APIClient.swift
+++ b/Specs/PetstoreTest/generated/Swift/Sources/APIClient.swift
@@ -114,6 +114,8 @@ public class APIClient {
                             multipartFormData.append(url, withName: name)
                         } else if let data = value as? Data {
                             multipartFormData.append(data, withName: name)
+                        } else if let string = value as? String {
+                            multipartFormData.append(Data(string.utf8), withName: name)
                         }
                     }
                 },
diff --git a/Specs/Rocket/generated/Swift/Sources/APIClient.swift b/Specs/Rocket/generated/Swift/Sources/APIClient.swift
index 163bc020d..c895c5b7d 100644
--- a/Specs/Rocket/generated/Swift/Sources/APIClient.swift
+++ b/Specs/Rocket/generated/Swift/Sources/APIClient.swift
@@ -114,6 +114,8 @@ public class APIClient {
                             multipartFormData.append(url, withName: name)
                         } else if let data = value as? Data {
                             multipartFormData.append(data, withName: name)
+                        } else if let string = value as? String {
+                            multipartFormData.append(Data(string.utf8), withName: name)
                         }
                     }
                 },
diff --git a/Specs/TBX/generated/Swift/Sources/APIClient.swift b/Specs/TBX/generated/Swift/Sources/APIClient.swift
index ce2b0e02f..9ba576fce 100644
--- a/Specs/TBX/generated/Swift/Sources/APIClient.swift
+++ b/Specs/TBX/generated/Swift/Sources/APIClient.swift
@@ -114,6 +114,8 @@ public class APIClient {
                             multipartFormData.append(url, withName: name)
                         } else if let data = value as? Data {
                             multipartFormData.append(data, withName: name)
+                        } else if let string = value as? String {
+                            multipartFormData.append(Data(string.utf8), withName: name)
                         }
                     }
                 },
diff --git a/Specs/TFL/generated/Swift/Sources/APIClient.swift b/Specs/TFL/generated/Swift/Sources/APIClient.swift
index 9e235185e..d2bc3a1fd 100644
--- a/Specs/TFL/generated/Swift/Sources/APIClient.swift
+++ b/Specs/TFL/generated/Swift/Sources/APIClient.swift
@@ -114,6 +114,8 @@ public class APIClient {
                             multipartFormData.append(url, withName: name)
                         } else if let data = value as? Data {
                             multipartFormData.append(data, withName: name)
+                        } else if let string = value as? String {
+                            multipartFormData.append(Data(string.utf8), withName: name)
                         }
                     }
                 },
diff --git a/Specs/TestSpec/generated/Swift/Sources/APIClient.swift b/Specs/TestSpec/generated/Swift/Sources/APIClient.swift
index 9923003fc..330810816 100644
--- a/Specs/TestSpec/generated/Swift/Sources/APIClient.swift
+++ b/Specs/TestSpec/generated/Swift/Sources/APIClient.swift
@@ -114,6 +114,8 @@ public class APIClient {
                             multipartFormData.append(url, withName: name)
                         } else if let data = value as? Data {
                             multipartFormData.append(data, withName: name)
+                        } else if let string = value as? String {
+                            multipartFormData.append(Data(string.utf8), withName: name)
                         }
                     }
                 },