diff --git a/src/NimBLECharacteristic.cpp b/src/NimBLECharacteristic.cpp
index 5c3ff94..6f7d3d7 100644
--- a/src/NimBLECharacteristic.cpp
+++ b/src/NimBLECharacteristic.cpp
@@ -240,7 +240,7 @@ int NimBLECharacteristic::handleGapEvent(uint16_t conn_handle, uint16_t attr_han
                     if((len + next->om_len) > BLE_ATT_ATTR_MAX_LEN) {
                         return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
                     }
-                    memcpy(&buf[len-1], next->om_data, next->om_len);
+                    memcpy(&buf[len], next->om_data, next->om_len);
                     len += next->om_len;
                     next = SLIST_NEXT(next, om_next);
                 }