diff --git a/crates/ra_lsp_server/src/conv.rs b/crates/ra_lsp_server/src/conv.rs
index 5fa52ec1b45..d78f7792558 100644
--- a/crates/ra_lsp_server/src/conv.rs
+++ b/crates/ra_lsp_server/src/conv.rs
@@ -6,8 +6,8 @@
 };
 use ra_ide_api::{
     translate_offset_with_edit, CompletionItem, CompletionItemKind, FileId, FilePosition,
-    FileRange, FileSystemEdit, InsertTextFormat, LineCol, LineIndex, NavigationTarget, RangeInfo,
-    Severity, SourceChange, SourceFileEdit,
+    FileRange, FileSystemEdit, Fold, FoldKind, InsertTextFormat, LineCol, LineIndex,
+    NavigationTarget, RangeInfo, Severity, SourceChange, SourceFileEdit,
 };
 use ra_syntax::{SyntaxKind, TextRange, TextUnit};
 use ra_text_edit::{AtomTextEdit, TextEdit};
@@ -225,6 +225,26 @@ fn conv_with(
     }
 }
 
+impl ConvWith<&LineIndex> for Fold {
+    type Output = lsp_types::FoldingRange;
+
+    fn conv_with(self, line_index: &LineIndex) -> lsp_types::FoldingRange {
+        let range = self.range.conv_with(&line_index);
+        lsp_types::FoldingRange {
+            start_line: range.start.line,
+            start_character: Some(range.start.character),
+            end_line: range.end.line,
+            end_character: Some(range.end.character),
+            kind: match self.kind {
+                FoldKind::Comment => Some(lsp_types::FoldingRangeKind::Comment),
+                FoldKind::Imports => Some(lsp_types::FoldingRangeKind::Imports),
+                FoldKind::Mods => None,
+                FoldKind::Block => None,
+            },
+        }
+    }
+}
+
 impl<T: ConvWith<CTX>, CTX> ConvWith<CTX> for Option<T> {
     type Output = Option<T::Output>;
 
diff --git a/crates/ra_lsp_server/src/main_loop/handlers.rs b/crates/ra_lsp_server/src/main_loop/handlers.rs
index f18a6871efb..ae57e57e95e 100644
--- a/crates/ra_lsp_server/src/main_loop/handlers.rs
+++ b/crates/ra_lsp_server/src/main_loop/handlers.rs
@@ -3,14 +3,11 @@
 use lsp_server::ErrorCode;
 use lsp_types::{
     CodeAction, CodeActionResponse, CodeLens, Command, CompletionItem, Diagnostic,
-    DocumentFormattingParams, DocumentHighlight, DocumentSymbol, FoldingRange, FoldingRangeKind,
-    FoldingRangeParams, Hover, HoverContents, Location, MarkupContent, MarkupKind, Position,
-    PrepareRenameResponse, Range, RenameParams, SymbolInformation, TextDocumentIdentifier,
-    TextEdit, WorkspaceEdit,
-};
-use ra_ide_api::{
-    AssistId, FileId, FilePosition, FileRange, FoldKind, Query, Runnable, RunnableKind,
+    DocumentFormattingParams, DocumentHighlight, DocumentSymbol, FoldingRange, FoldingRangeParams,
+    Hover, HoverContents, Location, MarkupContent, MarkupKind, Position, PrepareRenameResponse,
+    Range, RenameParams, SymbolInformation, TextDocumentIdentifier, TextEdit, WorkspaceEdit,
 };
+use ra_ide_api::{AssistId, FileId, FilePosition, FileRange, Query, Runnable, RunnableKind};
 use ra_prof::profile;
 use ra_syntax::{AstNode, SyntaxKind, TextRange, TextUnit};
 use rustc_hash::FxHashMap;
@@ -383,32 +380,9 @@ pub fn handle_folding_range(
     params: FoldingRangeParams,
 ) -> Result<Option<Vec<FoldingRange>>> {
     let file_id = params.text_document.try_conv_with(&world)?;
+    let folds = world.analysis().folding_ranges(file_id)?;
     let line_index = world.analysis().file_line_index(file_id)?;
-
-    let res = Some(
-        world
-            .analysis()
-            .folding_ranges(file_id)?
-            .into_iter()
-            .map(|fold| {
-                let kind = match fold.kind {
-                    FoldKind::Comment => Some(FoldingRangeKind::Comment),
-                    FoldKind::Imports => Some(FoldingRangeKind::Imports),
-                    FoldKind::Mods => None,
-                    FoldKind::Block => None,
-                };
-                let range = fold.range.conv_with(&line_index);
-                FoldingRange {
-                    start_line: range.start.line,
-                    start_character: Some(range.start.character),
-                    end_line: range.end.line,
-                    end_character: Some(range.end.character),
-                    kind,
-                }
-            })
-            .collect(),
-    );
-
+    let res = Some(folds.into_iter().map_conv_with(&*line_index).collect());
     Ok(res)
 }