diff --git a/docs/configuration.md b/docs/configuration.md
index bfcdf77f94..7fa5c29917 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -4878,7 +4878,7 @@ and similarly has cross-parameter interactions:
 - interaction with `config-style` parameters:
   - when [config-style is forced](#forcing-config-style), it takes precedence
     over binpacking
-  - for `newlines.source=classic/keep`, formatting is mandated by the
+  - for `newlines.source=classic`, formatting is mandated by the
     [scala.js](https://github.com/scala-js/scala-js/pull/4522#issuecomment-879168123)
     coding style, determined by the position of the closing parenthesis; "tucked"
     parenthesis enables binpacking, while "dangling" one forces config-style
diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/Router.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/Router.scala
index c9c82a227b..4b738635f9 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/Router.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/Router.scala
@@ -1285,7 +1285,11 @@ class Router(formatOps: FormatOps) {
             if (needOnelinePolicy) nextCommaOnelinePolicy else Some(NoPolicy)
           def bothPolicies = newlineBeforeClose & binPackOnelinePolicyOpt
           if (onlyConfigStyle != ConfigStyle.None)
-            if (styleMap.forcedBinPack(leftOwner)) bothPolicies
+            if (
+              (style.newlines.source == Newlines.keep &&
+                onlyConfigStyle == ConfigStyle.Source) ||
+              styleMap.forcedBinPack(leftOwner)
+            ) bothPolicies
             else splitOneArgOneLine(close, leftOwner) | newlineBeforeClose
           else if (
             mustDangleForTrailingCommas ||
diff --git a/scalafmt-tests/src/test/resources/newlines/source_keep.stat b/scalafmt-tests/src/test/resources/newlines/source_keep.stat
index 376319fc50..73ccfa3d62 100644
--- a/scalafmt-tests/src/test/resources/newlines/source_keep.stat
+++ b/scalafmt-tests/src/test/resources/newlines/source_keep.stat
@@ -7483,8 +7483,7 @@ object Main {
 object Main {
   val bar1 = foo1(
     10000,
-    10001,
-    10002 + 0
+    10001, 10002 + 0
   )
   val bar2 = foo2(
     0,
@@ -7619,8 +7618,7 @@ object Main {
 object Main {
   val bar1 = foo1(
     10000,
-    10001,
-    10002 + 0
+    10001, 10002 + 0
   )
   val bar2 = foo2(
     0,