diff --git a/package/yast2-installation.changes b/package/yast2-installation.changes
index 53f7dd44f..ce2876504 100644
--- a/package/yast2-installation.changes
+++ b/package/yast2-installation.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Fri Apr 17 16:10:19 UTC 2020 - Knut Anderssen <kanderssen@suse.com>
+
+- Force the use of en_US.UTF-8 when running firstboot or the
+  AutoYaST Second Stage with 'POSIX' or 'C as RC_LANG (bsc#1169017)
+- 3.4.1
+
 -------------------------------------------------------------------
 Wed Sep 25 08:02:58 UTC 2019 - Steffen Winterfeldt <snwint@suse.com>
 
diff --git a/package/yast2-installation.spec b/package/yast2-installation.spec
index c906471e1..d668c8fd8 100644
--- a/package/yast2-installation.spec
+++ b/package/yast2-installation.spec
@@ -17,7 +17,7 @@
 
 
 Name:           yast2-installation
-Version:        3.4.0
+Version:        3.4.1
 Release:        0
 
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
diff --git a/startup/common/language.sh b/startup/common/language.sh
index 0e3396443..cc0c5ceac 100644
--- a/startup/common/language.sh
+++ b/startup/common/language.sh
@@ -73,8 +73,13 @@ function set_language_cont () {
                 export RC_LANG=en_US
         fi
 
-        # get rid of encoding and/or modifier
-        export LANG=${RC_LANG%%[.@]*}.UTF-8
+        if [ "$RC_LANG" == "POSIX" ] || [ "$RC_LANG" == "C" ] ; then
+                log "\tRC_LANG is ${RC_LANG}, using LANG en_US.UTF-8 as default..."
+                export LANG=en_US.UTF-8
+        else
+                # get rid of encoding and/or modifier
+                export LANG=${RC_LANG%%[.@]*}.UTF-8
+        fi
 }
 
 #----[ start_unicode ]-----#