diff --git a/src/Sodaq_nbIOT.cpp b/src/Sodaq_nbIOT.cpp
index adedeb5..41269a6 100644
--- a/src/Sodaq_nbIOT.cpp
+++ b/src/Sodaq_nbIOT.cpp
@@ -609,20 +609,26 @@ ResponseTypes Sodaq_nbIOT::_socketReceiveParser(ResponseTypes &response, const c
     // <socket>,<ip_addr>,<port>,<length>,<data>,<remaining_length>
     SerialUSB.println(__FILE__": _socketReceiveParser() buffer:");
     SerialUSB.println(buffer);
-    // create a result buffer for the HEX string input
+    /**
+     * create a result buffer for the HEX string input
+     * 250 is SODAQ_AT_DEVICE_DEFAULT_INPUT_BUFFER_SIZE defined in Sodaq_AT_Device.h
+     * should probably refactor some more and move it to Sodaq_AT_Device.h
+     * we probably only need half of this (+1)
+     */
     auto * resultBuffer = static_cast<char*>(malloc(250));
-    memset(resultBuffer,0,250);
+    memset(resultBuffer, 0, 250);
     if (sscanf(buffer, "%d,%[^,],%d,%d,%[^,],%d", &tmp_sock, tmp_ip, &tmp_port, &tpm_length, resultBuffer, &tpm_length_rem) == 6) {
         SerialUSB.println(__FILE__": _socketReceiveParser() OK");
         int i;
         for(i=0; i < tpm_length;i++) {
             parsedBuffer[i] = HEX_PAIR_TO_BYTE(resultBuffer[i*2], resultBuffer[i*2+1]);
         }
-//        parsedBuffer[i*2] = 0;
+        free(resultBuffer);
         return ResponseEmpty;
     }
 
     SerialUSB.println(__FILE__": _socketReceiveParser() ERR");
+    free(resultBuffer);
     return ResponseError;
 }