diff --git a/client/src/mifare/desfirecore.c b/client/src/mifare/desfirecore.c
index 608059882..2e0654c30 100644
--- a/client/src/mifare/desfirecore.c
+++ b/client/src/mifare/desfirecore.c
@@ -913,6 +913,20 @@ int DesfireFormatPICC(DesfireContext *dctx) {
     return PM3_SUCCESS;
 }
 
+int DesfireGetFreeMem(DesfireContext *dctx, uint32_t *freemem) {
+    *freemem = 0;
+    uint8_t respcode = 0xff;
+    uint8_t resp[257] = {0};
+    size_t resplen = 0;
+    int res = DesfireExchange(dctx, MFDES_GET_FREE_MEMORY, NULL, 0, &respcode, resp, &resplen);
+    if (res != PM3_SUCCESS)
+        return res;
+    if (respcode != MFDES_S_OPERATION_OK || resplen != 3)
+        return PM3_EAPDU_FAIL;
+    *freemem = DesfireAIDByteToUint(resp);
+    return PM3_SUCCESS;
+}
+
 int DesfireGetUID(DesfireContext *dctx, uint8_t *resp, size_t *resplen) {
     uint8_t respcode = 0xff;
     int res = DesfireExchange(dctx, MFDES_GET_UID, NULL, 0, &respcode, resp, resplen);
diff --git a/client/src/mifare/desfirecore.h b/client/src/mifare/desfirecore.h
index 0da4fcbfe..acc7bd7af 100644
--- a/client/src/mifare/desfirecore.h
+++ b/client/src/mifare/desfirecore.h
@@ -41,6 +41,7 @@ int DesfireSelectAndAuthenticate(DesfireContext *dctx, DesfireSecureChannel secu
 int DesfireAuthenticate(DesfireContext *dctx, DesfireSecureChannel secureChannel);
 
 int DesfireFormatPICC(DesfireContext *dctx);
+int DesfireGetFreeMem(DesfireContext *dctx, uint32_t *freemem);
 int DesfireGetUID(DesfireContext *dctx, uint8_t *resp, size_t *resplen);
 int DesfireGetAIDList(DesfireContext *dctx, uint8_t *resp, size_t *resplen);
 int DesfireGetDFList(DesfireContext *dctx, uint8_t *resp, size_t *resplen);