diff --git a/src/main/kotlin/io/bazel/kotlin/plugin/jdeps/JdepsGenCommandLineProcessor.kt b/src/main/kotlin/io/bazel/kotlin/plugin/jdeps/JdepsGenCommandLineProcessor.kt
index 55444ef..3c19ca9 100644
--- a/src/main/kotlin/io/bazel/kotlin/plugin/jdeps/JdepsGenCommandLineProcessor.kt
+++ b/src/main/kotlin/io/bazel/kotlin/plugin/jdeps/JdepsGenCommandLineProcessor.kt
@@ -5,6 +5,7 @@
 import org.jetbrains.kotlin.compiler.plugin.CliOptionProcessingException
 import org.jetbrains.kotlin.compiler.plugin.CommandLineProcessor
 import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.config.CompilerConfigurationKey
 
 class JdepsGenCommandLineProcessor : CommandLineProcessor {
   companion object {
@@ -55,4 +56,22 @@
       else -> throw CliOptionProcessingException("Unknown option: ${option.optionName}")
     }
   }
+
+  override fun <T> CompilerConfiguration.appendList(
+    option: CompilerConfigurationKey<List<T>>,
+    value: T,
+  ) {
+    val paths = getList(option).toMutableList()
+    paths.add(value)
+    put(option, paths)
+  }
+
+  override fun <T> CompilerConfiguration.appendList(
+    option: CompilerConfigurationKey<List<T>>,
+    values: List<T>,
+  ) {
+    val paths = getList(option).toMutableList()
+    paths.addAll(values)
+    put(option, paths)
+  }
 }