diff --git a/src/main/scala/millfork/CompilationOptions.scala b/src/main/scala/millfork/CompilationOptions.scala
index dce46541..6e94b850 100644
--- a/src/main/scala/millfork/CompilationOptions.scala
+++ b/src/main/scala/millfork/CompilationOptions.scala
@@ -33,7 +33,7 @@ case class CompilationOptions(platform: Platform, commandLineFlags: Map[Compilat
     if (platform.cpu == Cmos) {
       ErrorReporting.warn("Illegal opcodes enabled for CMOS architecture", this)
     }
-    if (platform.cpu == StrictRicoh || platform.cpu == Ricoh) {
+    if (platform.cpu == StrictRicoh || platform.cpu == StrictMos) {
       ErrorReporting.warn("Illegal opcodes enabled for strict architecture", this)
     }
   }
diff --git a/src/main/scala/millfork/Platform.scala b/src/main/scala/millfork/Platform.scala
index 1d05edf9..3e26588b 100644
--- a/src/main/scala/millfork/Platform.scala
+++ b/src/main/scala/millfork/Platform.scala
@@ -54,7 +54,7 @@ object Platform {
     conf.read(new StringReader(new String(bytes, StandardCharsets.UTF_8)))
 
     val cs = conf.getSection("compilation")
-    val cpu = Cpu.fromString(cs.get(classOf[String], "cpu", "strict"))
+    val cpu = Cpu.fromString(cs.get(classOf[String], "arch", "strict"))
     val flagOverrides = CompilationFlag.fromString.flatMap { case (k, f) =>
       cs.get(classOf[String], k, "").toLowerCase match {
         case "" => None