diff --git a/radio/src/storage/yaml/yaml_datastructs_funcs.cpp b/radio/src/storage/yaml/yaml_datastructs_funcs.cpp
index 9df703d97..5a9eadfc6 100644
--- a/radio/src/storage/yaml/yaml_datastructs_funcs.cpp
+++ b/radio/src/storage/yaml/yaml_datastructs_funcs.cpp
@@ -1478,6 +1478,7 @@ static bool w_logicSw(void* user, uint8_t* data, uint32_t bitoffs,
       if (!wf(opaque,"-",1)) return false;
     } else {
       str = yaml_unsigned2str(lswTimerValue(ls->v2 + ls->v3));
+      if (!wf(opaque, str, strlen(str))) return false;
     }
     break;