diff --git a/client/jansson/value.c b/client/jansson/value.c
index fcc0caa2c..7c1bc9438 100644
--- a/client/jansson/value.c
+++ b/client/jansson/value.c
@@ -861,19 +861,19 @@ double json_number_value(const json_t *json) {
 /*** simple values ***/
 
 json_t *json_true(void) {
-    static json_t the_true = {JSON_TRUE, (size_t) -1};
+    static json_t the_true = {JSON_TRUE, (size_t) - 1};
     return &the_true;
 }
 
 
 json_t *json_false(void) {
-    static json_t the_false = {JSON_FALSE, (size_t) -1};
+    static json_t the_false = {JSON_FALSE, (size_t) - 1};
     return &the_false;
 }
 
 
 json_t *json_null(void) {
-    static json_t the_null = {JSON_NULL, (size_t) -1};
+    static json_t the_null = {JSON_NULL, (size_t) - 1};
     return &the_null;
 }