diff --git a/flang/runtime/io-stmt.cpp b/flang/runtime/io-stmt.cpp
--- a/flang/runtime/io-stmt.cpp
+++ b/flang/runtime/io-stmt.cpp
@@ -1340,7 +1340,7 @@
   case HashInquiryKeyword("STREAM"):
   case HashInquiryKeyword("WRITE"):
   case HashInquiryKeyword("UNFORMATTED"):
-    ToFortranDefaultCharacter(result, length, "UNKNONN");
+    ToFortranDefaultCharacter(result, length, "UNKNOWN");
     return true;
   default:
     BadInquiryKeywordHashCrash(inquiry);