diff --git a/src/parse/state/mustache.ts b/src/parse/state/mustache.ts
index 980ec8555a..bdeb8bdede 100644
--- a/src/parse/state/mustache.ts
+++ b/src/parse/state/mustache.ts
@@ -316,6 +316,8 @@ export default function mustache(parser: Parser) {
 		}
 	} else if (parser.eat('@html')) {
 		// {@html content} tag
+		parser.requireWhitespace();
+
 		const expression = readExpression(parser);
 
 		parser.allowWhitespace();
diff --git a/test/parser/samples/raw-mustaches-whitespace-error/error.json b/test/parser/samples/raw-mustaches-whitespace-error/error.json
new file mode 100644
index 0000000000..abb9f8ed0f
--- /dev/null
+++ b/test/parser/samples/raw-mustaches-whitespace-error/error.json
@@ -0,0 +1,10 @@
+{
+	"code": "missing-whitespace",
+	"message": "Expected whitespace",
+	"start": {
+		"line": 1,
+		"column": 6,
+		"character": 6
+	},
+	"pos": 6
+}
diff --git a/test/parser/samples/raw-mustaches-whitespace-error/input.svelte b/test/parser/samples/raw-mustaches-whitespace-error/input.svelte
new file mode 100644
index 0000000000..94e75fda09
--- /dev/null
+++ b/test/parser/samples/raw-mustaches-whitespace-error/input.svelte
@@ -0,0 +1 @@
+{@htmlfoo}