diff --git a/.eslintignore b/.eslintignore
index 08ec761fb3..cfd87467f1 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,4 +1,4 @@
-src/vector/modernizr.js
+src/vector/modernizr.cjs
 test/end-to-end-tests/node_modules/
 test/end-to-end-tests/element/
 test/end-to-end-tests/synapse/
diff --git a/.prettierignore b/.prettierignore
index abaa4d3df3..cade5f84bb 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -21,7 +21,7 @@ electron/pub
 /build_config.yaml
 # Raises an error because it contains a template var breaking the script tag
 src/vector/index.html
-src/vector/modernizr.js
+src/vector/modernizr.cjs
 /docs/lib
 /book
 /debian/tmp
diff --git a/sonar-project.properties b/sonar-project.properties
index c1d3f59842..6e39daebba 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -17,7 +17,7 @@ sonar.coverage.exclusions=\
   playwright/**/*,\
   res/**/*,\
   scripts/**/*,\
-  src/vector/modernizr.js,\
+  src/vector/modernizr.cjs,\
   src/components/views/dialogs/devtools/**/*,\
   src/utils/SessionLock.ts,\
   src/**/*.d.ts,\