diff --git a/hash_table.h b/hash_table.h
index e064af1..951bd2d 100644
--- a/hash_table.h
+++ b/hash_table.h
@@ -199,6 +199,7 @@ static int PREFIX(_table_resize)(PREFIX(_table) *table)
 	__sync_synchronize();
 	table->old = NULL;
 #	if !defined(ENABLE_GC) && defined(MAP_TABLE_SINGLE_THREAD)
+	free(copy->table);
 	free(copy);
 #	endif
 	return 1;
diff --git a/selector_table.c b/selector_table.c
index d75e1c4..c2629cf 100644
--- a/selector_table.c
+++ b/selector_table.c
@@ -211,6 +211,7 @@ static inline uint32_t hash_selector(const void *s)
 }
 
 #define MAP_TABLE_NAME selector
+#define MAP_TABLE_SINGLE_THREAD
 #define MAP_TABLE_COMPARE_FUNCTION selector_identical
 #define MAP_TABLE_HASH_KEY hash_selector
 #define MAP_TABLE_HASH_VALUE hash_selector
@@ -245,6 +246,7 @@ PRIVATE void init_selector_tables()
 static SEL selector_lookup(const char *name, const char *types)
 {
 	struct objc_selector sel = {{name}, types};
+	LOCK_FOR_SCOPE(&selector_table_lock);
 	return selector_table_get(sel_table, &sel);
 }
 static inline void add_selector_to_table(SEL aSel, int32_t uid, uint32_t idx)