diff --git a/src/ckpool.h b/src/ckpool.h
index c0dad52e..f6d25dd4 100644
--- a/src/ckpool.h
+++ b/src/ckpool.h
@@ -261,6 +261,7 @@ enum stratum_msgtype {
 	SM_TXNSRESULT,
 	SM_PING,
 	SM_WORKINFO,
+	SM_SUGGESTDIFF,
 	SM_NONE
 };
 
@@ -280,6 +281,7 @@ static const char __maybe_unused *stratum_msgs[] = {
 	"txns.result",
 	"ping",
 	"workinfo",
+	"suggestdiff",
 	""
 };
 
diff --git a/src/stratifier.c b/src/stratifier.c
index adc66442..4cd531e3 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -5370,6 +5370,8 @@ out:
 			ret = SM_AUTH;
 		else if (cmdmatch(method, "mining.get"))
 			ret = SM_TXNS;
+		else if (cmdmatch(method, "mining.suggest_difficulty"))
+			ret = SM_SUGGESTDIFF;
 	}
 	return ret;
 }