diff --git a/ip/xfrm_state.c b/ip/xfrm_state.c
index 389942c..f4ad4cb 100644
--- a/ip/xfrm_state.c
+++ b/ip/xfrm_state.c
@@ -162,7 +162,7 @@
 			if (len > max)
 				invarg("ALGO-KEYMAT value makes buffer overflow\n", key);
 
-			strncpy(buf, key, len);
+			memcpy(buf, key, len);
 		}
 	}