diff --git a/lib/RuntimeTemplate.js b/lib/RuntimeTemplate.js
index 95f0e9014..319c4f8dd 100644
--- a/lib/RuntimeTemplate.js
+++ b/lib/RuntimeTemplate.js
@@ -580,13 +580,15 @@ class RuntimeTemplate {
 	}) {
 		if (runtimeCondition === undefined) return "true";
 		if (typeof runtimeCondition === "boolean") return `${runtimeCondition}`;
+		/** @type {Set<string>} */
 		const positiveRuntimeIds = new Set();
 		forEachRuntime(runtimeCondition, runtime =>
-			positiveRuntimeIds.add(chunkGraph.getRuntimeId(runtime))
+			positiveRuntimeIds.add(`${chunkGraph.getRuntimeId(runtime)}`)
 		);
+		/** @type {Set<string>} */
 		const negativeRuntimeIds = new Set();
 		forEachRuntime(subtractRuntime(runtime, runtimeCondition), runtime =>
-			negativeRuntimeIds.add(chunkGraph.getRuntimeId(runtime))
+			negativeRuntimeIds.add(`${chunkGraph.getRuntimeId(runtime)}`)
 		);
 		runtimeRequirements.add(RuntimeGlobals.runtimeId);
 		return compileBooleanMatcher.fromLists(
diff --git a/test/configCases/graph/issue-11770/test.config.js b/test/configCases/graph/issue-11770/test.config.js
index 57e2cfc59..a8eced3a6 100644
--- a/test/configCases/graph/issue-11770/test.config.js
+++ b/test/configCases/graph/issue-11770/test.config.js
@@ -1,5 +1,5 @@
 module.exports = {
 	findBundle: function (i, options) {
-		return ["shared.js", "a.js", "b.js", "c.js"];
+		return ["shared.js", "a.js", "b.js", "c1.js", "c2.js"];
 	}
 };
diff --git a/test/configCases/graph/issue-11770/webpack.config.js b/test/configCases/graph/issue-11770/webpack.config.js
index 14601fdd1..e5f367f3f 100644
--- a/test/configCases/graph/issue-11770/webpack.config.js
+++ b/test/configCases/graph/issue-11770/webpack.config.js
@@ -3,7 +3,8 @@ module.exports = {
 	entry: {
 		a: "./a",
 		b: "./b",
-		c: "./c"
+		c1: "./c",
+		c2: "./c"
 	},
 	target: "web",
 	output: {