diff --git a/companion/src/firmwares/radiodata.h b/companion/src/firmwares/radiodata.h
index d289f1846..7b5caa9b6 100644
--- a/companion/src/firmwares/radiodata.h
+++ b/companion/src/firmwares/radiodata.h
@@ -12,7 +12,8 @@ class RadioDataConversionState;
 class CategoryData {
   public:
     CategoryData(const char * name) {
-      strncpy(this->name, name, sizeof(CategoryData::name));
+      memset(this->name, 0, sizeof(CategoryData::name));
+      strncpy(this->name, name, sizeof(CategoryData::name)-1);
     }
     char name[15+1];
 };