diff --git a/src/shared/set.c b/src/shared/set.c
index 84ab82a70..af9cdb5dd 100644
--- a/src/shared/set.c
+++ b/src/shared/set.c
@@ -54,7 +54,7 @@ int set_consume(Set *s, void *value) {
         int r;
 
         r = set_put(s, value);
-        if (r < 0)
+        if (r <= 0)
                 free(value);
 
         return r;