diff --git a/development/Win32/packaging/installer/lang/slovak.nsh b/development/Win32/packaging/installer/lang/slovak.nsh
index abfef3e7da..f5e75f6bf0 100644
--- a/development/Win32/packaging/installer/lang/slovak.nsh
+++ b/development/Win32/packaging/installer/lang/slovak.nsh
@@ -1,3 +1,4 @@
+#-*-coding: windows-1250;-*-
 /*
 LyX Installer Language File
 Language: Slovak