diff --git a/rtgui/extprog.cc b/rtgui/extprog.cc
index 95c1c937d..00ea07713 100644
--- a/rtgui/extprog.cc
+++ b/rtgui/extprog.cc
@@ -334,7 +334,7 @@ bool ExtProgStore::openInCustomEditor (const Glib::ustring& fileName)
 
 #else
 
-    const auto cmdLine = Glib::ustring("\"") + options.customEditorProg + "\" " + Glib::shell_quote(fileName);
+    const auto cmdLine = options.customEditorProg + Glib::ustring(" ") + Glib::shell_quote(fileName);
     return spawnCommandAsync (cmdLine);
 
 #endif