Mark Object instances const

1 files changed, 1 insertions, 1 deletions

diff --git a/Header.h b/Header.h
index 2637dc99..9059a9f4 100644
--- a/Header.h
+++ b/Header.h
@@ -34,7 +34,7 @@ MeterModeId Header_addMeterByName(Header* this, char* name, int column);
 
 void Header_setMode(Header* this, int i, MeterModeId mode, int column);
 
-Meter* Header_addMeterByClass(Header* this, MeterClass* type, int param, int column);
+Meter* Header_addMeterByClass(Header* this, const MeterClass* type, int param, int column);
 
 int Header_size(Header* this, int column);