diff --git a/packages/webpack-cli/lib/utils/flag-defaults.js b/packages/webpack-cli/lib/utils/flag-defaults.js
index cba1043786a..0aa2996f98f 100644
--- a/packages/webpack-cli/lib/utils/flag-defaults.js
+++ b/packages/webpack-cli/lib/utils/flag-defaults.js
@@ -5,8 +5,10 @@ const cacheDefaults = (finalConfig, parsedArgs, outputOptions) => {
     if (hasCache && (parsedArgs.config || outputOptions.defaultConfig)) {
         if (finalConfig.cache && finalConfig.cache.type === 'filesystem') {
             cacheConfig.buildDependencies = {
-                config: parsedArgs.config || outputOptions.defaultConfig,
+                config: parsedArgs.config || [outputOptions.defaultConfig],
             };
+        } else {
+            cacheConfig = finalConfig.cache;
         }
         return { cache: cacheConfig };
     }
diff --git a/test/core-flags/cache-flags.test.js b/test/core-flags/cache-flags.test.js
index 57a1f0338ac..0381474d0af 100644
--- a/test/core-flags/cache-flags.test.js
+++ b/test/core-flags/cache-flags.test.js
@@ -118,6 +118,17 @@ describe('cache related flags from core', () => {
         expect(exitCode).toEqual(0);
     });
 
+    it('should assign cache build dependencies with default config', () => {
+        // TODO: Fix on windows
+        if (isWindows) return;
+        const { stderr, stdout, exitCode } = run(__dirname, ['--cache-type', 'filesystem']);
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('buildDependencies');
+        expect(stdout).toContain(`'${path.join(__dirname, './webpack.config.js')}'`);
+        expect(stdout).toContain("type: 'filesystem'");
+        expect(exitCode).toEqual(0);
+    });
+
     it('should assign cache build dependencies with merged configs', () => {
         // TODO: Fix on windows
         if (isWindows) return;