diff --git a/misc/nsis/ioquake3.nsi.in b/misc/nsis/ioquake3.nsi.in
index d0333f46..fe765f03 100644
--- a/misc/nsis/ioquake3.nsi.in
+++ b/misc/nsis/ioquake3.nsi.in
@@ -136,7 +136,7 @@ SectionEnd
 Section "Protocol Handler" ProtocolHandler
 
   WriteRegStr SHCTX "Software\Classes\quake3" "CustomUrlApplication" "$INSTDIR\ioquake3.x86.exe"
-  WriteRegStr SHCTX "Software\Classes\quake3" "CustomUrlArguments" '"%1"'
+  WriteRegStr SHCTX "Software\Classes\quake3" "CustomUrlArguments" '--uri "%1"'
   WriteRegStr SHCTX "Software\Classes\quake3" "URL Protocol" ""
   WriteRegStr SHCTX "Software\Classes\quake3\DefaultIcon" "" "$INSTDIR\ioquake3.x86.exe,0"
   WriteRegStr SHCTX "Software\Classes\quake3\shell\open\command" "" '"$INSTDIR\ioquake3.x86.exe" --uri "%1"'