diff --git a/spec/workspace-spec.js b/spec/workspace-spec.js
index bdd5677c8..476a4ba5b 100644
--- a/spec/workspace-spec.js
+++ b/spec/workspace-spec.js
@@ -2394,6 +2394,22 @@ i = /test/; #FIXME\
           expect(results[0].replacements).toBe(6)
         })
       })
+
+      it('does not discard the multiline flag', () => {
+        const filePath = path.join(projectDir, 'sample.js')
+        fs.copyFileSync(path.join(fixturesDir, 'sample.js'), filePath)
+
+        const results = []
+        waitsForPromise(() =>
+          atom.workspace.replace(/;$/gmi, 'items', [filePath], result => results.push(result))
+        )
+
+        runs(() => {
+          expect(results).toHaveLength(1)
+          expect(results[0].filePath).toBe(filePath)
+          expect(results[0].replacements).toBe(8)
+        })
+      })
     })
 
     describe('when a buffer is already open', () => {
diff --git a/src/workspace.js b/src/workspace.js
index 3bf112461..17c6b2a8b 100644
--- a/src/workspace.js
+++ b/src/workspace.js
@@ -1950,6 +1950,7 @@ module.exports = class Workspace extends Model {
 
       if (!outOfProcessFinished.length) {
         let flags = 'g'
+        if (regex.multiline) { flags += 'm' }
         if (regex.ignoreCase) { flags += 'i' }
 
         const task = Task.once(