diff --git a/providers/implementations/rands/seed_src_jitter.c b/providers/implementations/rands/seed_src_jitter.c
index 3dea0959d4..af8d5c4852 100644
--- a/providers/implementations/rands/seed_src_jitter.c
+++ b/providers/implementations/rands/seed_src_jitter.c
@@ -104,7 +104,7 @@ static size_t get_jitter_random_value(PROV_JITTER *s,
             break;
 
         /* Success */
-        if (result == len)
+        if (result >= 0 && (size_t)result == len)
             return len;
     }