diff --git a/lib/rules/indentation/index.js b/lib/rules/indentation/index.js
index 4e703bbf3a..c7fdb30fa4 100644
--- a/lib/rules/indentation/index.js
+++ b/lib/rules/indentation/index.js
@@ -628,7 +628,7 @@ function inferRootIndentLevel(root, baseIndentLevel, indentSize) {
 	}
 
 	const indents = [];
-	const foundIndents = /(?:^|\n)([ \t]*)\S[^\r\n]*(?:\r?\n\s*)*$/m.exec(root.raws.beforeStart);
+	const foundIndents = /(?:^|\n)([ \t]*)\S/m.exec(root.raws.beforeStart);
 
 	// The indent level of the CSS code block in non-CSS-like files is determined by the shortest indent of non-empty line.
 	if (foundIndents) {