diff --git a/src/core/hle/service/time/time_zone_manager.cpp b/src/core/hle/service/time/time_zone_manager.cpp
index 63aacd19f1..43d0a19b87 100644
--- a/src/core/hle/service/time/time_zone_manager.cpp
+++ b/src/core/hle/service/time/time_zone_manager.cpp
@@ -911,7 +911,9 @@ static Result ToCalendarTimeInternal(const TimeZoneRule& rules, s64 time,
 
     calendar_additional_info.is_dst = rules.ttis[tti_index].is_dst;
     const char* time_zone{&rules.chars[rules.ttis[tti_index].abbreviation_list_index]};
-    for (int index{}; time_zone[index] != '\0'; ++index) {
+    for (u32 index{}; time_zone[index] != '\0' && time_zone[index] != ',' &&
+                      index < calendar_additional_info.timezone_name.size() - 1;
+         ++index) {
         calendar_additional_info.timezone_name[index] = time_zone[index];
     }
     return ResultSuccess;