diff --git a/src/libiso8601/100_leap.c b/src/libiso8601/100_leap.c
index 9257976..20647de 100644
--- a/src/libiso8601/100_leap.c
+++ b/src/libiso8601/100_leap.c
@@ -73,8 +73,13 @@ int iso8601_leap_elapsed(const struct iso8601_date* start, const struct iso8601_
 
 
 
+static int leap_table_free_old = 0;
+
 void iso8601_leap_table_set(int* new_table, int new_size)
 {
+    if(leap_table_free_old) free(leap_second_days);
+    leap_table_free_old = 0;
+
     leap_second_days = new_table;
     leap_second_days_num = new_size;
 }
@@ -133,6 +138,7 @@ int iso8601_leap_table_load(const char* fname)
 
     TEMP_FAILURE_RETRY( close(fd) );
     iso8601_leap_table_set(days, new_size);
+    leap_table_free_old = 1;
     return 0;
 
 #undef GET_UINT32