diff --git a/CHANGES.md b/CHANGES.md
index 9b44a09a05..78c9fbe6c7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -8,6 +8,7 @@ Grammars:
 - fix(fsharp) Highlight operators, match type names only in type annotations, support quoted identifiers, and other smaller fixes. [Melvyn Laïly][]
 - enh(java) add `sealed` and `non-sealed` keywords (#3386) [Bradley Mackey][]
 - enh(nsis) Update defines pattern to allow `!` (#3417) [idleberg][]
+- enh(nsis) Update language strings pattern to allow `!` (#3420) [idleberg][]
 - fix(clojure) Several issues with Clojure highlighting (#3397) [Björn Ebbinghaus][]
   - fix(clojure) `comment` macro catches more than it should (#3395)
   - fix(clojure) `$` in symbol breaks highlighting
diff --git a/src/languages/nsis.js b/src/languages/nsis.js
index 40f359d731..17438c682d 100644
--- a/src/languages/nsis.js
+++ b/src/languages/nsis.js
@@ -167,7 +167,7 @@ export default function(hljs) {
   const LANGUAGES = {
     // $(language_strings)
     className: 'variable',
-    begin: /\$+\([\w^.:-]+\)/
+    begin: /\$+\([\w^.:!-]+\)/
   };
 
   const PARAMETERS = {