diff --git a/mu/mu-config.c b/mu/mu-config.c
index aa0caca4..1810ebe5 100644
--- a/mu/mu-config.c
+++ b/mu/mu-config.c
@@ -482,7 +482,7 @@ cmd_from_string (const char *str)
 #ifdef BUILD_GUILE
 	/* if we don't recognize it and it's not an option, it may be
 	 * some script */
-	if (str[0] == '-')
+	if (str[0] != '-')
 		return MU_CONFIG_CMD_SCRIPT;
 #endif /*BUILD_GUILE*/