diff --git a/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java b/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java
index 685d02808c8..6af6919215b 100644
--- a/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java
+++ b/libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java
@@ -470,7 +470,9 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
                 arguments.pluginClasspaths = pluginClassPaths.toArray(new String[pluginClassPaths.size()]);
             } else {
                 for (String path : pluginClassPaths) {
-                    arguments.pluginClasspaths = ArrayUtil.append(arguments.pluginClasspaths, path);
+                    if (ArrayUtil.indexOf(arguments.pluginClasspaths, path) < 0) {
+                        arguments.pluginClasspaths = ArrayUtil.append(arguments.pluginClasspaths, path);
+                    }
                 }
             }