diff --git a/include/haproxy/stick_table-t.h b/include/haproxy/stick_table-t.h
index fe23848dd..4b984396e 100644
--- a/include/haproxy/stick_table-t.h
+++ b/include/haproxy/stick_table-t.h
@@ -119,7 +119,7 @@ union stktable_data {
 	unsigned long long std_t_ull;
 	struct freq_ctr std_t_frqp;
 	struct dict_entry *std_t_dict;
-} __attribute__((packed));
+} __attribute__((packed, aligned(sizeof(int))));
 
 /* known data types */
 struct stktable_data_type {