diff --git a/plugins/mgmtops.c b/plugins/mgmtops.c
index d354bc6..5de0aa2 100644
--- a/plugins/mgmtops.c
+++ b/plugins/mgmtops.c
@@ -367,7 +367,7 @@ static void mgmt_new_link_key(int sk, uint16_t index, void *buf, size_t len)
 	struct controller_info *info;
 
 	if (len != sizeof(*ev)) {
-		error("new_key event size mismatch (%zu != %zu)",
+		error("mgmt_new_link_key event size mismatch (%zu != %zu)",
 							len, sizeof(*ev));
 		return;
 	}
@@ -1071,7 +1071,8 @@ static void read_local_oob_data_complete(int sk, uint16_t index, void *buf,
 	struct btd_adapter *adapter;
 
 	if (len != sizeof(*rp)) {
-		error("Wrong read_local_oob_data_complete event size");
+		error("read_local_oob_data_complete event size mismatch "
+					"(%zu != %zu)", len, sizeof(*rp));
 		return;
 	}
 
@@ -1313,7 +1314,7 @@ static void mgmt_device_found(int sk, uint16_t index, void *buf, size_t len)
 
 	eir_len = bt_get_le16(&ev->eir_len);
 	if (len != sizeof(*ev) + eir_len) {
-		error("mgmt_device_found length %zu instead of expected %zu",
+		error("mgmt_device_found event size mismatch (%zu != %zu)",
 						len, sizeof(*ev) + eir_len);
 		return;
 	}
@@ -1445,7 +1446,7 @@ static void mgmt_new_ltk(int sk, uint16_t index, void *buf, size_t len)
 	struct controller_info *info;
 
 	if (len != sizeof(*ev)) {
-		error("new_smp_key event size mismatch (%zu != %zu)",
+		error("mgmt_new_ltk event size mismatch (%zu != %zu)",
 							len, sizeof(*ev));
 		return;
 	}