diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c
index 8d48245a5..792dc95f3 100644
--- a/client/cmdhfmf.c
+++ b/client/cmdhfmf.c
@@ -1932,7 +1932,7 @@ static int CmdHF14AMfChk(const char *Cmd) {
 
 
     uint8_t trgKeyType = 0;
-    uint16_t max_keys = keycnt > ((PM3_CMD_DATA_SIZE - 4) / 6) ? ((PM3_CMD_DATA_SIZE - 4) / 6) : keycnt;
+    uint16_t max_keys = keycnt > KEYS_IN_BLOCK ? KEYS_IN_BLOCK : keycnt;
 
     // time
     uint64_t t1 = msclock();
diff --git a/client/mifare/mifarehost.c b/client/mifare/mifarehost.c
index 16ecc80cd..f9f80aa5c 100644
--- a/client/mifare/mifarehost.c
+++ b/client/mifare/mifarehost.c
@@ -90,7 +90,7 @@ int mfDarkside(uint8_t blockno, uint8_t key_type, uint64_t *key) {
 
         *key = UINT64_C(-1);
         uint8_t keyBlock[PM3_CMD_DATA_SIZE];
-        uint32_t max_keys = (PM3_CMD_DATA_SIZE - 4) / 6;
+        uint32_t max_keys = KEYS_IN_BLOCK;
         for (uint32_t i = 0; i < keycount; i += max_keys) {
 
             uint32_t size = keycount - i > max_keys ? max_keys : keycount - i;
@@ -227,10 +227,6 @@ int mfCheckKeys_fast(uint8_t sectorsCnt, uint8_t firstChunk, uint8_t lastChunk,
 // ref: https://github.com/J-Run/mf_key_brute
 int mfKeyBrute(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint64_t *resultkey) {
 
-#define KEYS_IN_BLOCK   ((PM3_CMD_DATA_SIZE - 4) / 6)
-#define KEYBLOCK_SIZE   (KEYS_IN_BLOCK * 6)
-#define CANDIDATE_SIZE  (0xFFFF * 6)
-
     uint64_t key64;
     uint8_t found = false;
     uint8_t candidates[CANDIDATE_SIZE] = {0x00};
@@ -386,7 +382,7 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo,
     uint64_t key64 = -1;
 
     // The list may still contain several key candidates. Test each of them with mfCheckKeys
-    uint32_t max_keys = keycnt > ((PM3_CMD_DATA_SIZE - 4) / 6) ? ((PM3_CMD_DATA_SIZE - 4) / 6) : keycnt;
+    uint32_t max_keys = keycnt > KEYS_IN_BLOCK ? KEYS_IN_BLOCK : keycnt;
     uint8_t keyBlock[PM3_CMD_DATA_SIZE] = {0x00};
 
     for (i = 0; i < keycnt; i += max_keys) {
diff --git a/client/mifare/mifarehost.h b/client/mifare/mifarehost.h
index fd3935d41..90837bcf7 100644
--- a/client/mifare/mifarehost.h
+++ b/client/mifare/mifarehost.h
@@ -68,6 +68,9 @@ typedef struct {
 } icesector_t;
 
 extern char logHexFileName[FILE_PATH_SIZE];
+#define KEYS_IN_BLOCK   ((PM3_CMD_DATA_SIZE - 4) / 6)
+#define KEYBLOCK_SIZE   (KEYS_IN_BLOCK * 6)
+#define CANDIDATE_SIZE  (0xFFFF * 6)
 
 int mfDarkside(uint8_t blockno, uint8_t key_type, uint64_t *key);
 int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate);