diff --git a/src/DeclarationIndex.ts b/src/DeclarationIndex.ts
index ca16a03..9a94afa 100644
--- a/src/DeclarationIndex.ts
+++ b/src/DeclarationIndex.ts
@@ -383,7 +383,7 @@ export class DeclarationIndex {
                 if (!index[declaration.name]) {
                     index[declaration.name] = [];
                 }
-                const from = key.replace(/[/]?index$/, '') || '/';
+                const from = key.replace(/\/index$/, '') || '/';
                 if (!index[declaration.name].some(
                     o => o.declaration.constructor === declaration.constructor && o.from === from,
                 )) {
diff --git a/test/_workspace/declaration-index/_index.ts b/test/_workspace/declaration-index/_index.ts
new file mode 100644
index 0000000..c5eec96
--- /dev/null
+++ b/test/_workspace/declaration-index/_index.ts
@@ -0,0 +1 @@
+export let _index;
diff --git a/test/_workspace/declaration-index/index.ts b/test/_workspace/declaration-index/index.ts
new file mode 100644
index 0000000..4d8b863
--- /dev/null
+++ b/test/_workspace/declaration-index/index.ts
@@ -0,0 +1 @@
+export let barrelExport;
diff --git a/test/declaration-index/DeclarationIndex.spec.ts b/test/declaration-index/DeclarationIndex.spec.ts
index 069665e..eafa7dc 100644
--- a/test/declaration-index/DeclarationIndex.spec.ts
+++ b/test/declaration-index/DeclarationIndex.spec.ts
@@ -40,6 +40,8 @@ describe('DeclarationIndex', () => {
             join(rootPath, 'helper-functions.ts'),
             join(rootPath, 'myReactTemplate.tsx'),
             join(rootPath, 'prototype-funcs.ts'),
+            join(rootPath, 'index.ts'),
+            join(rootPath, '_index.ts'),
         ];
 
         beforeEach(async () => {
@@ -84,6 +86,14 @@ describe('DeclarationIndex', () => {
             expect(resource).toMatchSnapshot();
         });
 
+        it('should properly index non-barrel files ending in `index`', () => {
+            const barrelExport = declarationIndex.index!['barrelExport'];
+            expect(barrelExport).toMatchSnapshot();
+
+            const _index = declarationIndex.index!['_index'];
+            expect(_index).toMatchSnapshot();
+        });
+
     });
 
     describe('reindexForChanges()', () => {
@@ -183,7 +193,7 @@ describe('DeclarationIndex', () => {
                                                 export class FancierLibraryClass {
                                                     public doSomethingAwesome(): void { }
                                                 }
-                                                
+
                                                 export * from './foobar'`,
             });
 
@@ -265,7 +275,7 @@ describe('DeclarationIndex', () => {
                                                 export class FancierLibraryClass {
                                                     public doSomethingAwesome(): void { }
                                                 }
-                                                
+
                                                 export * from './foobar'`,
             });
 
@@ -290,7 +300,7 @@ describe('DeclarationIndex', () => {
                                                 export class FancierLibraryClass {
                                                     public doSomethingAwesome(): void { }
                                                 }
-                                                
+
                                                 export * from './foobar'`,
             });
 
diff --git a/test/declaration-index/__snapshots__/DeclarationIndex.spec.ts.snap b/test/declaration-index/__snapshots__/DeclarationIndex.spec.ts.snap
index a2c99fe..d3ba399 100644
--- a/test/declaration-index/__snapshots__/DeclarationIndex.spec.ts.snap
+++ b/test/declaration-index/__snapshots__/DeclarationIndex.spec.ts.snap
@@ -66,6 +66,8 @@ Array [
   "/helper-functions",
   "/myReactTemplate",
   "/prototype-funcs",
+  "/index",
+  "/_index",
 ]
 `;
 
@@ -127,6 +129,38 @@ Array [
 ]
 `;
 
+exports[`DeclarationIndex buildIndex() should properly index non-barrel files ending in \`index\` 1`] = `
+Array [
+  DeclarationInfo {
+    "declaration": VariableDeclaration {
+      "end": 24,
+      "isConst": false,
+      "isExported": true,
+      "name": "barrelExport",
+      "start": 0,
+      "type": undefined,
+    },
+    "from": "/",
+  },
+]
+`;
+
+exports[`DeclarationIndex buildIndex() should properly index non-barrel files ending in \`index\` 2`] = `
+Array [
+  DeclarationInfo {
+    "declaration": VariableDeclaration {
+      "end": 18,
+      "isConst": false,
+      "isExported": true,
+      "name": "_index",
+      "start": 0,
+      "type": undefined,
+    },
+    "from": "/_index",
+  },
+]
+`;
+
 exports[`DeclarationIndex calculateIndexDelta() should calculate a newly added declaration 1`] = `
 Object {
   "added": Object {