diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/GenericRunner.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/GenericRunner.kt
index 27419c02..fb2b0927 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/GenericRunner.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/GenericRunner.kt
@@ -30,7 +30,7 @@ abstract class GenericTestRunner: ITestRunnerContributor {
 
     open val extraClasspath: List<String> = emptyList()
 
-    open fun filterTestClasses(classes: List<String>) : List<String> = classes
+    open fun filterTestClasses(project: Project, context: KobaltContext, classes: List<String>) : List<String> = classes
 
     override fun run(project: Project, context: KobaltContext, configName: String,
             classpath: List<IClasspathDependency>) : TaskResult {
@@ -69,7 +69,7 @@ abstract class GenericTestRunner: ITestRunnerContributor {
 //            }
 
         context.logger.log(project.name, 2, "Found ${result.size} test classes")
-        return filterTestClasses(result.map { it.second })
+        return filterTestClasses(project, context, result.map { it.second })
     }
 
     /**
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/JUnitRunner.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/JUnitRunner.kt
index bfe6d800..c5b36997 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/JUnitRunner.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/JUnitRunner.kt
@@ -4,6 +4,10 @@ import com.beust.kobalt.TestConfig
 import com.beust.kobalt.api.IClasspathDependency
 import com.beust.kobalt.api.KobaltContext
 import com.beust.kobalt.api.Project
+import com.beust.kobalt.maven.DependencyManager
+import com.google.inject.Inject
+import java.lang.reflect.Modifier
+import java.net.URLClassLoader
 
 open class JUnitRunner() : GenericTestRunner() {
 
@@ -14,5 +18,15 @@ open class JUnitRunner() : GenericTestRunner() {
 
     override fun args(project: Project, context: KobaltContext, classpath: List<IClasspathDependency>,
             testConfig: TestConfig) = findTestClasses(project, context, testConfig)
+
+    @Inject
+    lateinit var dependencyManager: DependencyManager
+
+    override fun filterTestClasses(project: Project, context: KobaltContext, classes: List<String>) : List<String> {
+        val deps = dependencyManager.testDependencies(project, context)
+        val cl = URLClassLoader(deps.map { it.jarFile.get().toURI().toURL() }.toTypedArray())
+        return classes.filter { !Modifier.isAbstract(cl.loadClass(it).modifiers) }
+    }
+
 }
 
diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/KotlinTestRunner.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/KotlinTestRunner.kt
index b78da1db..24e643d5 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/KotlinTestRunner.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/internal/KotlinTestRunner.kt
@@ -1,5 +1,8 @@
 package com.beust.kobalt.internal
 
+import com.beust.kobalt.api.KobaltContext
+import com.beust.kobalt.api.Project
+
 /**
  * KotlinTestRunner triggers if it finds a dependency on io.kotlintest but other than that, it just
  * uses the regular JUnitRunner.
@@ -12,6 +15,7 @@ class KotlinTestRunner : JUnitRunner() {
      * KotlinTestRunner runs tests in the init{} initializer, so ignore all the extra
      * classes generated by the Kotlin compiler.
      */
-    override fun filterTestClasses(classes: List<String>) = classes.filter { ! it.contains("$") }
+    override fun filterTestClasses(projet: Project, context: KobaltContext, classes: List<String>)
+            = classes.filter { !it.contains("$") }
 }