diff --git a/include/proto/pattern.h b/include/proto/pattern.h
index ea8cf0dfe..25a00d6f8 100644
--- a/include/proto/pattern.h
+++ b/include/proto/pattern.h
@@ -25,6 +25,8 @@
 #include <types/pattern.h>
 #include <types/stick_table.h>
 
+extern struct pattern temp_pattern;
+
 struct pattern_expr *pattern_parse_expr(char **str, int *idx, char *err, int err_size);
 struct pattern *pattern_process(struct proxy *px, struct session *l4,
                                 void *l7, int dir, struct pattern_expr *expr,
diff --git a/src/pattern.c b/src/pattern.c
index 59ff010dd..bebeabedb 100644
--- a/src/pattern.c
+++ b/src/pattern.c
@@ -18,7 +18,7 @@
 #include <common/standard.h>
 
 /* static structure used on pattern_process if <p> is NULL*/
-static struct pattern spattern;
+struct pattern temp_pattern = { };
 
 /* trash chunk used for pattern conversions */
 static struct chunk trash_chunk;
@@ -469,7 +469,7 @@ struct pattern *pattern_process(struct proxy *px, struct session *l4, void *l7,
 	struct pattern_conv_expr *conv_expr;
 
 	if (p == NULL)
-		p = &spattern;
+		p = &temp_pattern;
 
 	if (!expr->fetch->process(px, l4, l7, dir, expr->arg_p, expr->arg_i, &p->data))
 		return NULL;