diff --git a/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts b/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts
index da5c09351..4fb9ecfdd 100644
--- a/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts
+++ b/packages/language-server/src/plugins/typescript/DocumentSnapshot.ts
@@ -664,7 +664,7 @@ export class DtsDocumentSnapshot extends JSOrTSDocumentSnapshot implements Docum
         }
 
         return {
-            line: mapped.line,
+            line: mapped.line - 1,
             character: mapped.column,
             uri: pathToUrl(originalFilePath)
         };
diff --git a/packages/language-server/test/plugins/typescript/TypescriptPlugin.test.ts b/packages/language-server/test/plugins/typescript/TypescriptPlugin.test.ts
index 8ef10793e..9e65beb1c 100644
--- a/packages/language-server/test/plugins/typescript/TypescriptPlugin.test.ts
+++ b/packages/language-server/test/plugins/typescript/TypescriptPlugin.test.ts
@@ -569,12 +569,12 @@ describe('TypescriptPlugin', function () {
         assert.deepStrictEqual(definition, [
             <LocationLink>{
                 targetRange: {
-                    end: { line: 1, character: 18 },
-                    start: { line: 1, character: 16 }
+                    end: { line: 0, character: 18 },
+                    start: { line: 0, character: 16 }
                 },
                 targetSelectionRange: {
-                    start: { line: 1, character: 16 },
-                    end: { line: 1, character: 18 }
+                    start: { line: 0, character: 16 },
+                    end: { line: 0, character: 18 }
                 },
                 originSelectionRange: {
                     start: { line: 1, character: 13 },
@@ -592,12 +592,12 @@ describe('TypescriptPlugin', function () {
         assert.deepStrictEqual(definition, [
             <LocationLink>{
                 targetRange: {
-                    end: { line: 1, character: 18 },
-                    start: { line: 1, character: 16 }
+                    end: { line: 0, character: 18 },
+                    start: { line: 0, character: 16 }
                 },
                 targetSelectionRange: {
-                    start: { line: 1, character: 16 },
-                    end: { line: 1, character: 18 }
+                    start: { line: 0, character: 16 },
+                    end: { line: 0, character: 18 }
                 },
                 originSelectionRange: {
                     start: { line: 1, character: 13 },
diff --git a/packages/language-server/test/plugins/typescript/features/FindReferencesProvider.test.ts b/packages/language-server/test/plugins/typescript/features/FindReferencesProvider.test.ts
index aa160034a..c68e3679a 100644
--- a/packages/language-server/test/plugins/typescript/features/FindReferencesProvider.test.ts
+++ b/packages/language-server/test/plugins/typescript/features/FindReferencesProvider.test.ts
@@ -319,8 +319,8 @@ describe('FindReferencesProvider', function () {
         assert.deepStrictEqual(references, <Location[]>[
             {
                 range: {
-                    end: { line: 1, character: 18 },
-                    start: { line: 1, character: 16 }
+                    end: { line: 0, character: 18 },
+                    start: { line: 0, character: 16 }
                 },
                 uri: getUri('declaration-map/declaration-map-project/index.ts')
             },
diff --git a/packages/language-server/test/plugins/typescript/features/ImplemenationProvider.test.ts b/packages/language-server/test/plugins/typescript/features/ImplemenationProvider.test.ts
index c272b0ebb..57ad86192 100644
--- a/packages/language-server/test/plugins/typescript/features/ImplemenationProvider.test.ts
+++ b/packages/language-server/test/plugins/typescript/features/ImplemenationProvider.test.ts
@@ -89,8 +89,8 @@ describe('ImplementationProvider', function () {
         assert.deepStrictEqual(implementations, <Location[]>[
             {
                 range: {
-                    end: { line: 1, character: 18 },
-                    start: { line: 1, character: 16 }
+                    end: { line: 0, character: 18 },
+                    start: { line: 0, character: 16 }
                 },
                 uri: getUri('../declaration-map/declaration-map-project/index.ts')
             }
diff --git a/packages/language-server/test/plugins/typescript/features/TypeDefinitionProvider.test.ts b/packages/language-server/test/plugins/typescript/features/TypeDefinitionProvider.test.ts
index 9a38c34d4..f4e0baa44 100644
--- a/packages/language-server/test/plugins/typescript/features/TypeDefinitionProvider.test.ts
+++ b/packages/language-server/test/plugins/typescript/features/TypeDefinitionProvider.test.ts
@@ -98,8 +98,8 @@ describe('TypeDefinitionProvider', function () {
         assert.deepStrictEqual(typeDefs, <Location[]>[
             {
                 range: {
-                    end: { line: 1, character: 18 },
-                    start: { line: 1, character: 16 }
+                    end: { line: 0, character: 18 },
+                    start: { line: 0, character: 16 }
                 },
                 uri: getUri('../declaration-map/declaration-map-project/index.ts')
             }