diff --git a/scalac-scoverage-plugin/src/main/scala/scoverage/plugin.scala b/scalac-scoverage-plugin/src/main/scala/scoverage/plugin.scala
index fa9bd3ea..609dcebc 100644
--- a/scalac-scoverage-plugin/src/main/scala/scoverage/plugin.scala
+++ b/scalac-scoverage-plugin/src/main/scala/scoverage/plugin.scala
@@ -18,15 +18,19 @@ class ScoveragePlugin(val global: Global) extends Plugin {
   val instrumentationComponent = new ScoverageInstrumentationComponent(global, extraAfterPhase, extraBeforePhase)
   override val components: List[PluginComponent] = List(instrumentationComponent)
 
+  private def parseExclusionEntry(entryName: String, inOption: String): Seq[String] =
+    inOption.substring(entryName.length).split(";").map(_.trim).toIndexedSeq.filterNot(_.isEmpty)
+
   override def processOptions(opts: List[String], error: String => Unit): Unit = {
     val options = new ScoverageOptions
+
     for (opt <- opts) {
       if (opt.startsWith("excludedPackages:")) {
-        options.excludedPackages = opt.substring("excludedPackages:".length).split(";").map(_.trim).filterNot(_.isEmpty)
+        options.excludedPackages = parseExclusionEntry("excludedPackages", opt)
       } else if (opt.startsWith("excludedFiles:")) {
-        options.excludedFiles = opt.substring("excludedFiles:".length).split(";").map(_.trim).filterNot(_.isEmpty)
+        options.excludedFiles = parseExclusionEntry("excludedFiles", opt)
       } else if (opt.startsWith("excludedSymbols:")) {
-        options.excludedSymbols = opt.substring("excludedSymbols:".length).split(";").map(_.trim).filterNot(_.isEmpty)
+        options.excludedSymbols = parseExclusionEntry("excludedSymbols", opt)
       } else if (opt.startsWith("dataDir:")) {
         options.dataDir = opt.substring("dataDir:".length)
       } else if (opt.startsWith("extraAfterPhase:") || opt.startsWith("extraBeforePhase:")) {
diff --git a/scalac-scoverage-plugin/src/test/scala/scoverage/IOUtilsTest.scala b/scalac-scoverage-plugin/src/test/scala/scoverage/IOUtilsTest.scala
index f653b835..d17a6c56 100644
--- a/scalac-scoverage-plugin/src/test/scala/scoverage/IOUtilsTest.scala
+++ b/scalac-scoverage-plugin/src/test/scala/scoverage/IOUtilsTest.scala
@@ -36,7 +36,7 @@ class IOUtilsTest extends FreeSpec with MockitoSugar with OneInstancePerTest wit
       writer2.close()
 
       val files = IOUtils.findMeasurementFiles(file1.getParent)
-      val invoked = IOUtils.invoked(files)
+      val invoked = IOUtils.invoked(files.toIndexedSeq)
       assert(invoked.toSet === Set(1, 2, 5, 7, 9, 10, 14))
 
       file1.delete()
diff --git a/scalac-scoverage-plugin/src/test/scala/scoverage/PluginCoverageTest.scala b/scalac-scoverage-plugin/src/test/scala/scoverage/PluginCoverageTest.scala
index 20c9b895..2c292f61 100644
--- a/scalac-scoverage-plugin/src/test/scala/scoverage/PluginCoverageTest.scala
+++ b/scalac-scoverage-plugin/src/test/scala/scoverage/PluginCoverageTest.scala
@@ -263,9 +263,10 @@ class PluginCoverageTest
                                    |    }
                                    |  }""".stripMargin)
     assert(!compiler.reporter.hasErrors)
-    // 2 statements for the two applies in Seq, one for each literal which is 6, one for the flat map,
-    // one for the map, one for the yield op.
-    compiler.assertNMeasuredStatements(11)
+    // 2 statements for the two applies in Seq, one for each literal which is 6, one for the operation passed to yield.
+    // Depending on the collections api version, there can be additional implicit canBuildFrom statements.
+    val expectedStatementsCount = if (ScoverageCompiler.ShortScalaVersion < "2.13") 11 else 9
+    compiler.assertNMeasuredStatements(expectedStatementsCount)
   }
 
   test("plugin should not instrument local macro implementation") {
diff --git a/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala b/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala
index 75abedbf..0a1b777c 100644
--- a/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala
+++ b/scalac-scoverage-plugin/src/test/scala/scoverage/ScoverageCompiler.scala
@@ -102,8 +102,9 @@ class ScoverageCompiler(settings: scala.tools.nsc.Settings, reporter: scala.tool
 
   def assertNoCoverage() = assert(!testStore.sources.mkString(" ").contains(s"scoverage.Invoker.invoked"))
 
+
   def assertNMeasuredStatements(n: Int): Unit = {
-    for ( k <- 1 to n ) {
+    for (k <- 1 to n) {
       assert(testStore.sources.mkString(" ").contains(s"scoverage.Invoker.invoked($k,"),
         s"Should be $n invoked statements but missing #$k")
     }
@@ -139,7 +140,7 @@ class ScoverageCompiler(settings: scala.tools.nsc.Settings, reporter: scala.tool
     class Transformer(unit: global.CompilationUnit) extends TypingTransformer(unit) {
 
       override def transform(tree: global.Tree) = {
-        sources append tree.toString
+        sources += tree.toString
         tree
       }
     }
diff --git a/scalac-scoverage-runtime/jvm/src/test/scala/scoverage/InvokerConcurrencyTest.scala b/scalac-scoverage-runtime/jvm/src/test/scala/scoverage/InvokerConcurrencyTest.scala
index 7943db95..d9e7f6cb 100644
--- a/scalac-scoverage-runtime/jvm/src/test/scala/scoverage/InvokerConcurrencyTest.scala
+++ b/scalac-scoverage-runtime/jvm/src/test/scala/scoverage/InvokerConcurrencyTest.scala
@@ -5,7 +5,6 @@ import java.util.concurrent.Executors
 
 import org.scalatest.{BeforeAndAfter, FunSuite}
 
-import scala.collection.breakOut
 import scala.concurrent._
 import scala.concurrent.duration._
 
@@ -29,17 +28,17 @@ class InvokerConcurrencyTest extends FunSuite with BeforeAndAfter {
 
     // Create 1k "invoked" calls on the common thread pool, to stress test
     // the method
-    val futures: List[Future[Unit]] = testIds.map { i: Int =>
+    val futures: Set[Future[Unit]] = testIds.map { i: Int =>
       Future {
         Invoker.invoked(i, measurementDir.toString)
       }
-    }(breakOut)
+    }
 
     futures.foreach(Await.result(_, 1.second))
 
     // Now verify that the measurement file is not corrupted by loading it
     val measurementFiles = Invoker.findMeasurementFiles(measurementDir)
-    val idsFromFile = Invoker.invoked(measurementFiles).toSet
+    val idsFromFile = Invoker.invoked(measurementFiles.toIndexedSeq).toSet
 
     idsFromFile === testIds
   }
diff --git a/scalac-scoverage-runtime/shared/src/test/scala/scoverage/InvokerMultiModuleTest.scala b/scalac-scoverage-runtime/shared/src/test/scala/scoverage/InvokerMultiModuleTest.scala
index 013153dd..2007c95d 100644
--- a/scalac-scoverage-runtime/shared/src/test/scala/scoverage/InvokerMultiModuleTest.scala
+++ b/scalac-scoverage-runtime/shared/src/test/scala/scoverage/InvokerMultiModuleTest.scala
@@ -27,12 +27,12 @@ class InvokerMultiModuleTest extends FunSuite with BeforeAndAfter {
 
     // Verify measurements went to correct directory
     val measurementFiles0 = Invoker.findMeasurementFiles(measurementDir(0))
-    val idsFromFile0 = Invoker.invoked(measurementFiles0).toSet
+    val idsFromFile0 = Invoker.invoked(measurementFiles0.toIndexedSeq).toSet
 
     idsFromFile0 === testIds.filter { i: Int => i % 2 == 0 }
 
     val measurementFiles1 = Invoker.findMeasurementFiles(measurementDir(0))
-    val idsFromFile1 = Invoker.invoked(measurementFiles1).toSet
+    val idsFromFile1 = Invoker.invoked(measurementFiles1.toIndexedSeq).toSet
     idsFromFile1 === testIds.filter { i: Int => i % 2 == 1 }
   }