diff --git a/.eslintrc.yaml b/.eslintrc.yaml
index 3f385f2fb..51926d896 100644
--- a/.eslintrc.yaml
+++ b/.eslintrc.yaml
@@ -21,6 +21,7 @@ globals:
 
 rules:
   # Code quality rules
+  eqeqeq: error
   "@typescript-eslint/no-empty-function": ["error", { "allow": ["arrowFunctions"] }]
   "@typescript-eslint/no-explicit-any": off # Allow explicit any to make incremental TypeScript adoption easier.
   no-unused-vars: off
diff --git a/src/util/parseNarrative.js b/src/util/parseNarrative.js
index d426a35a7..5ab213539 100644
--- a/src/util/parseNarrative.js
+++ b/src/util/parseNarrative.js
@@ -91,7 +91,7 @@ function* parseNarrativeBody(markdown, fallbackDataset, markdownParser) {
   const titleLinkSelector = "h1 > a:only-child";
   const isTitle = (node) =>
     node.nodeType === Node.ELEMENT_NODE &&
-    node.querySelector(titleLinkSelector) != null;
+    node.querySelector(titleLinkSelector) !== null;
 
   for (const titleLink of doc.querySelectorAll(titleLinkSelector)) {
     const slide = doc.createElement("slide");