diff --git a/src/rules/extensions.js b/src/rules/extensions.js
index 0fe605adcb..2c3b564086 100644
--- a/src/rules/extensions.js
+++ b/src/rules/extensions.js
@@ -132,10 +132,12 @@ module.exports = {
       // bail if the declaration doesn't have a source, e.g. "export { foo };"
       if (!source) return
 
-      const importPath = source.value
+      const importPathWithQueryString = source.value
 
       // don't enforce anything on builtins
-      if (isBuiltIn(importPath, context.settings)) return
+      if (isBuiltIn(importPathWithQueryString, context.settings)) return
+
+      const importPath = importPathWithQueryString.replace(/\?(.*)$/, '')
 
       const resolvedPath = resolve(importPath, context)
 
@@ -154,14 +156,14 @@ module.exports = {
           context.report({
             node: source,
             message:
-              `Missing file extension ${extension ? `"${extension}" ` : ''}for "${importPath}"`,
+              `Missing file extension ${extension ? `"${extension}" ` : ''}for "${source.value}"`,
           })
         }
       } else if (extension) {
         if (isUseOfExtensionForbidden(extension) && isResolvableWithoutExtension(importPath)) {
           context.report({
             node: source,
-            message: `Unexpected use of file extension "${extension}" for "${importPath}"`,
+            message: `Unexpected use of file extension "${extension}" for "${source.value}"`,
           })
         }
       }
diff --git a/tests/src/rules/extensions.js b/tests/src/rules/extensions.js
index a1629335c6..164f05f42a 100644
--- a/tests/src/rules/extensions.js
+++ b/tests/src/rules/extensions.js
@@ -116,6 +116,16 @@ ruleTester.run('extensions', rule, {
       ].join('\n'),
       options: [ 'never' ],
     }),
+
+    // Query strings.
+    test({
+      code: 'import bare from "./foo?a=True.ext"',
+      options: [ 'never' ],
+    }),
+    test({
+      code: 'import bare from "./foo.js?a=True"',
+      options: [ 'always' ],
+    }),
   ],
 
   invalid: [
@@ -381,5 +391,29 @@ ruleTester.run('extensions', rule, {
         },
       ],
     }),
+
+    // Query strings.
+    test({
+      code: 'import withExtension from "./foo.js?a=True"',
+      options: [ 'never' ],
+      errors: [
+        {
+          message: 'Unexpected use of file extension "js" for "./foo.js?a=True"',
+          line: 1,
+          column: 27,
+        },
+      ],
+    }),
+    test({
+      code: 'import withoutExtension from "./foo?a=True.ext"',
+      options: [ 'always' ],
+      errors: [
+        {
+          message: 'Missing file extension for "./foo?a=True.ext"',
+          line: 1,
+          column: 30,
+        },
+      ],
+    }),
   ],
 })