diff --git a/sys/dev/random/armv8rng.c b/sys/dev/random/armv8rng.c
--- a/sys/dev/random/armv8rng.c
+++ b/sys/dev/random/armv8rng.c
@@ -64,7 +64,7 @@
 		    /* 1 on success, 0 on failure */
 		    "cset	%w1, ne\n"
 		    : "=&r" (val), "=&r"(ret) :: "cc");
-	} while (ret != 0 && --loop > 0);
+	} while (ret == 0 && --loop > 0);
 
 	if (ret != 0)
 		*buf = val;