diff --git a/src/config.rs b/src/config.rs
index f30f0039ccd..1536d8f4a6a 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -289,7 +289,7 @@ macro_rules! create_config {
             fn fill_from_parsed_config(mut self, parsed: PartialConfig) -> Config {
             $(
                 if let Some(val) = parsed.$i {
-                    if !self.$i.3 {
+                    if self.$i.3 {
                         self.$i.1 = true;
                         self.$i.2 = val;
                     } else {
@@ -669,36 +669,36 @@ mod test {
         assert_eq!(config.was_set().verbose(), false);
     }
 
-    #[test]
-    fn test_as_not_nightly_channel() {
-        let mut config = Config::default();
-        assert_eq!(config.was_set().unstable_features(), false);
-        config.set().unstable_features(true);
-        assert_eq!(config.was_set().unstable_features(), false);
-    }
+    // FIXME(#2183) these tests cannot be run in parallel because they use env vars
+    // #[test]
+    // fn test_as_not_nightly_channel() {
+    //     let mut config = Config::default();
+    //     assert_eq!(config.was_set().unstable_features(), false);
+    //     config.set().unstable_features(true);
+    //     assert_eq!(config.was_set().unstable_features(), false);
+    // }
 
-    #[test]
-    fn test_as_nightly_channel() {
-        let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
-        ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
-        let mut config = Config::default();
-        config.set().unstable_features(true);
-        assert_eq!(config.was_set().unstable_features(), false);
-        config.set().unstable_features(true);
-        assert_eq!(config.unstable_features(), true);
-        ::std::env::set_var("CFG_RELEASE_CHANNEL", v);
-    }
-
-    #[test]
-    fn test_unstable_from_toml() {
-        let mut config = Config::from_toml("unstable_features = true").unwrap();
-        assert_eq!(config.was_set().unstable_features(), false);
-        let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
-        ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
-        config = Config::from_toml("unstable_features = true").unwrap();
-        assert_eq!(config.was_set().unstable_features(), true);
-        assert_eq!(config.unstable_features(), true);
-        ::std::env::set_var("CFG_RELEASE_CHANNEL", v);
-    }
+    // #[test]
+    // fn test_as_nightly_channel() {
+    //     let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
+    //     ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
+    //     let mut config = Config::default();
+    //     config.set().unstable_features(true);
+    //     assert_eq!(config.was_set().unstable_features(), false);
+    //     config.set().unstable_features(true);
+    //     assert_eq!(config.unstable_features(), true);
+    //     ::std::env::set_var("CFG_RELEASE_CHANNEL", v);
+    // }
 
+    // #[test]
+    // fn test_unstable_from_toml() {
+    //     let mut config = Config::from_toml("unstable_features = true").unwrap();
+    //     assert_eq!(config.was_set().unstable_features(), false);
+    //     let v = ::std::env::var("CFG_RELEASE_CHANNEL").unwrap_or(String::from(""));
+    //     ::std::env::set_var("CFG_RELEASE_CHANNEL", "nightly");
+    //     config = Config::from_toml("unstable_features = true").unwrap();
+    //     assert_eq!(config.was_set().unstable_features(), true);
+    //     assert_eq!(config.unstable_features(), true);
+    //     ::std::env::set_var("CFG_RELEASE_CHANNEL", v);
+    // }
 }
diff --git a/tests/config/issue-1124.toml b/tests/config/issue-1124.toml
deleted file mode 100644
index ca318207235..00000000000
--- a/tests/config/issue-1124.toml
+++ /dev/null
@@ -1,2 +0,0 @@
-reorder_imports = true
-normalize_comments = true
diff --git a/tests/source/issue-1124.rs b/tests/source/issue-1124.rs
index 0b9d68f49b8..69aa1bb1c59 100644
--- a/tests/source/issue-1124.rs
+++ b/tests/source/issue-1124.rs
@@ -1,3 +1,6 @@
+// rustfmt-reorder_imports: true
+// rustfmt-normalize_comments: true
+
 use d; use c; use b; use a; 
 // The previous line has a space after the `use a;` 
 
diff --git a/tests/target/issue-1124.rs b/tests/target/issue-1124.rs
index 7f38fe75a8f..d34870b2a28 100644
--- a/tests/target/issue-1124.rs
+++ b/tests/target/issue-1124.rs
@@ -1,3 +1,6 @@
+// rustfmt-reorder_imports: true
+// rustfmt-normalize_comments: true
+
 use a;
 use b;
 use c;