diff --git a/cli/src/main/scala/org/bykn/bosatsu/Main.scala b/cli/src/main/scala/org/bykn/bosatsu/Main.scala
index 46deb9423..fee059324 100644
--- a/cli/src/main/scala/org/bykn/bosatsu/Main.scala
+++ b/cli/src/main/scala/org/bykn/bosatsu/Main.scala
@@ -8,7 +8,7 @@ object Main extends IOApp {
       case Right(getOutput) =>
         PathModule.report(getOutput)
       case Left(help) =>
-        IO {
+        IO.blocking {
           System.err.println(help.toString)
           ExitCode.Error
         }
diff --git a/cli/src/main/scala/org/bykn/bosatsu/TypedExprToProto.scala b/cli/src/main/scala/org/bykn/bosatsu/ProtoConverter.scala
similarity index 99%
rename from cli/src/main/scala/org/bykn/bosatsu/TypedExprToProto.scala
rename to cli/src/main/scala/org/bykn/bosatsu/ProtoConverter.scala
index 43e4c49c3..92f52c1b9 100644
--- a/cli/src/main/scala/org/bykn/bosatsu/TypedExprToProto.scala
+++ b/cli/src/main/scala/org/bykn/bosatsu/ProtoConverter.scala
@@ -1450,7 +1450,7 @@ object ProtoConverter {
   def read[A <: GeneratedMessage](
       path: Path
   )(implicit gmc: GeneratedMessageCompanion[A]): IO[A] =
-    IO {
+    IO.blocking {
       val f = path.toFile
       val ios = new BufferedInputStream(new FileInputStream(f))
       try gmc.parseFrom(ios)
@@ -1460,7 +1460,7 @@ object ProtoConverter {
     }
 
   def write(a: GeneratedMessage, path: Path): IO[Unit] =
-    IO {
+    IO.blocking {
       val f = path.toFile
       val os = new BufferedOutputStream(new FileOutputStream(f))
       try a.writeTo(os)
diff --git a/cli/src/test/scala/org/bykn/bosatsu/TestProtoType.scala b/cli/src/test/scala/org/bykn/bosatsu/TestProtoType.scala
index f9f97c785..22a6f851d 100644
--- a/cli/src/test/scala/org/bykn/bosatsu/TestProtoType.scala
+++ b/cli/src/test/scala/org/bykn/bosatsu/TestProtoType.scala
@@ -55,7 +55,7 @@ class TestProtoType extends AnyFunSuite with ParTest {
   }
 
   def testWithTempFile(fn: Path => IO[Unit]): Unit = {
-    val tempRes = Resource.make(IO {
+    val tempRes = Resource.make(IO.blocking {
       val f = File.createTempFile("proto_test", ".proto")
       f.toPath
     }) { path =>