diff --git a/source/libublsettings.c b/source/libublsettings.c
index 62b9ec0..5bb67cf 100644
--- a/source/libublsettings.c
+++ b/source/libublsettings.c
@@ -335,6 +335,7 @@ int yon_char_find_last(char *source, char find){
     int size = strlen(source);
     int i=size;
     for (;source[i]!=find&&i>0;i--);
+    if (source[i]!=find)i=-1;
     return i;
 }