diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinWasmGradlePluginIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinWasmGradlePluginIT.kt
index 28b99ccf85094..bd79de314a19c 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinWasmGradlePluginIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinWasmGradlePluginIT.kt
@@ -350,4 +350,25 @@ class KotlinWasmGradlePluginIT : KGPBaseTest() {
             }
         }
     }
+
+    @DisplayName("Browser case works correctly with custom formatters")
+    @GradleTest
+    fun testWasmCustomFormattersUsage(gradleVersion: GradleVersion) {
+        project("wasm-browser-simple-project", gradleVersion) {
+            buildGradleKts.append(
+                //language=Kotlin
+                """
+                |
+                | tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinJsCompile>().configureEach {
+                |    compilerOptions.freeCompilerArgs.add("-Xwasm-debugger-custom-formatters")
+                | }
+                """.trimMargin()
+            )
+
+            build("wasmJsBrowserDistribution") {
+                assertTasksExecuted(":compileKotlinWasmJs")
+                assertTasksExecuted(":compileProductionExecutableKotlinWasmJs")
+            }
+        }
+    }
 }
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WasmConfigurationCacheIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WasmConfigurationCacheIT.kt
index b90330de2b883..2e064e53abc89 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WasmConfigurationCacheIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/WasmConfigurationCacheIT.kt
@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.gradle
 import org.gradle.util.GradleVersion
 import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.DisplayName
+import kotlin.io.path.appendText
 
 @MppGradlePluginTests
 class WasmConfigurationCacheIT : KGPBaseTest() {
diff --git a/prepare/compiler/build.gradle.kts b/prepare/compiler/build.gradle.kts
index 9cb6efea4b133..a81548631d592 100644
--- a/prepare/compiler/build.gradle.kts
+++ b/prepare/compiler/build.gradle.kts
@@ -319,6 +319,7 @@ val proguard by task<CacheableProguardTask> {
             !net/sf/cglib/**,
             !META-INF/maven**,
             **.class,**.properties,**.kt,**.kotlin_*,**.jnilib,**.so,**.dll,**.txt,**.caps,
+            custom-formatters.js,
             META-INF/services/**,META-INF/native/**,META-INF/extensions/**,META-INF/MANIFEST.MF,
             messages/**""".trimIndent()),
         packCompiler.map { it.outputs.files.singleFile }