diff --git a/epan/dissectors/packet-synphasor.c b/epan/dissectors/packet-synphasor.c
index 09fbb31d89..8f7f85aa33 100644
--- a/epan/dissectors/packet-synphasor.c
+++ b/epan/dissectors/packet-synphasor.c
@@ -779,9 +779,9 @@ static int dissect_config_frame(tvbuff_t *tvb, proto_item *config_item)
 		gint16 tmp = tvb_get_ntohs(tvb, offset);
 		temp_item  = proto_tree_add_text(config_tree, tvb, offset, 2, "Rate of transmission: "); offset += 2;
 		if (tmp > 0)
-			proto_item_append_text(temp_item, "%"G_GUINT16_FORMAT" frame(s) per second", tmp);
+			proto_item_append_text(temp_item, "%"G_GINT16_FORMAT" frame(s) per second", tmp);
 		else
-			proto_item_append_text(temp_item, "1 frame per %"G_GUINT16_FORMAT" second(s)", -tmp);
+			proto_item_append_text(temp_item, "1 frame per %"G_GINT16_FORMAT" second(s)", (gint16)-tmp);
 	}
 
 	return offset;
diff --git a/plugins/gryphon/packet-gryphon.c b/plugins/gryphon/packet-gryphon.c
index c1ca99cf99..28e0a75326 100644
--- a/plugins/gryphon/packet-gryphon.c
+++ b/plugins/gryphon/packet-gryphon.c
@@ -1594,7 +1594,7 @@ cmd_modresp(tvbuff_t *tvb, int offset, proto_tree *pt)
 	proto_tree_add_text(pt, tvb, offset, 1, "Response handle: %u",
 	    resp_handle);
     else if (dest)
-	proto_tree_add_text(pt, tvb, offset, 1, "Response handles: all on channel %hd", dest);
+	proto_tree_add_text(pt, tvb, offset, 1, "Response handles: all on channel %hhd", dest);
     else
     	proto_tree_add_text(pt, tvb, offset, 1, "Response handles: all");
     action = tvb_get_guint8(tvb, offset+1);