diff --git a/plugins/lv2/sfizz_lv2_common.cpp b/plugins/lv2/sfizz_lv2_common.cpp
index 702557b7..7881db1d 100644
--- a/plugins/lv2/sfizz_lv2_common.cpp
+++ b/plugins/lv2/sfizz_lv2_common.cpp
@@ -93,7 +93,7 @@ void sfizz_lv2_ccmap_free(sfizz_lv2_ccmap *ccmap)
     }
 }
 
-LV2_URID sfizz_lv2_ccmap_map(sfizz_lv2_ccmap *ccmap, int cc)
+LV2_URID sfizz_lv2_ccmap_map(const sfizz_lv2_ccmap *ccmap, int cc)
 {
     LV2_URID urid = 0;
     if (cc >= 0 && cc < sfz::config::numCCs)