diff --git a/src/spawn.c b/src/spawn.c
index cef46b3..82fb753 100644
--- a/src/spawn.c
+++ b/src/spawn.c
@@ -757,7 +757,7 @@ int run_def_action(int action, char *sname, char *dname, int delay)
 
 #else /* Linux */
 
-#define HANDBOOK_BROWSER "firefox"
+#define HANDBOOK_BROWSER "xdg-open"
 #define HANDBOOK_LOCATION "/usr/doc/mtpaint/index.html"
 #define HANDBOOK_LOCATION2 "/usr/share/doc/mtpaint/index.html"