diff --git a/src/nsis/i2pbrowser-installer.nsi b/src/nsis/i2pbrowser-installer.nsi
index f741e25..1594adc 100644
--- a/src/nsis/i2pbrowser-installer.nsi
+++ b/src/nsis/i2pbrowser-installer.nsi
@@ -17,6 +17,7 @@ UniCode true
 var FFINSTEXE
 var FFNONTORINSTEXE
 var I2PINSTEXE
+Var PARENTOPTIONS
 
 SetOverwrite on
 !define FFINSTEXE