diff --git a/libraries/AP_Logger/AP_Logger.cpp b/libraries/AP_Logger/AP_Logger.cpp
index 43bdad5952..55d2a02fa0 100644
--- a/libraries/AP_Logger/AP_Logger.cpp
+++ b/libraries/AP_Logger/AP_Logger.cpp
@@ -1187,9 +1187,9 @@ AP_Logger::log_write_fmt *AP_Logger::msg_fmt_for_name(const char *name, const ch
     memcpy((char*)ls_strings.format, f->fmt, MIN(sizeof(ls_strings.format), strlen(f->fmt)));
     memcpy((char*)ls_strings.labels, f->labels, MIN(sizeof(ls_strings.labels), strlen(f->labels)));
     if (f->units != nullptr) {
-        memcpy((char*)ls_strings.units, f->units, MIN(sizeof(ls.units), strlen(f->units)));
+        memcpy((char*)ls_strings.units, f->units, MIN(sizeof(ls_strings.units), strlen(f->units)));
     } else {
-        memset((char*)ls_strings.units, '?', MIN(sizeof(ls.format), strlen(f->fmt)));
+        memset((char*)ls_strings.units, '?', MIN(sizeof(ls_strings.format), strlen(f->fmt)));
     }
     if (f->mults != nullptr) {
         memcpy((char*)ls_strings.multipliers, f->mults, MIN(sizeof(ls_strings.multipliers), strlen(f->mults)));
diff --git a/libraries/AP_Scripting/lua_bindings.cpp b/libraries/AP_Scripting/lua_bindings.cpp
index 45f0bd7a94..580b417cc9 100644
--- a/libraries/AP_Scripting/lua_bindings.cpp
+++ b/libraries/AP_Scripting/lua_bindings.cpp
@@ -130,7 +130,7 @@ int AP_Logger_Write(lua_State *L) {
     struct AP_Logger::log_write_fmt *f;
     if (!have_units) {
         // ask for a mesage type
-        f = AP_logger->msg_fmt_for_name(name, label_cat, nullptr, nullptr, fmt_cat, true);
+        f = AP_logger->msg_fmt_for_name(name, label_cat, nullptr, nullptr, fmt_cat, true, true);
 
     } else {
         // read in units and multiplers strings
@@ -153,7 +153,7 @@ int AP_Logger_Write(lua_State *L) {
         strcat(multipliers_cat,multipliers);
 
         // ask for a mesage type
-        f = AP_logger->msg_fmt_for_name(name, label_cat, units_cat, multipliers_cat, fmt_cat, true);
+        f = AP_logger->msg_fmt_for_name(name, label_cat, units_cat, multipliers_cat, fmt_cat, true, true);
     }
 
     if (f == nullptr) {