diff --git a/lldb/source/Host/common/Editline.cpp b/lldb/source/Host/common/Editline.cpp
--- a/lldb/source/Host/common/Editline.cpp
+++ b/lldb/source/Host/common/Editline.cpp
@@ -1401,6 +1401,9 @@
     }
   }
 #endif
+
+  // Required for libedit unicode as it uses iswprint.
+  ::setlocale(LC_CTYPE, "");
 }
 
 Editline::~Editline() {