diff --git a/armsrc/mifarecmd.c b/armsrc/mifarecmd.c
index 6393ff7ad..4265c6181 100644
--- a/armsrc/mifarecmd.c
+++ b/armsrc/mifarecmd.c
@@ -1265,8 +1265,8 @@ void MifareStaticNested(uint8_t blockNo, uint8_t keyType, uint8_t targetBlockNo,
 
     int16_t isOK;
     uint32_t cuid;
-    uint32_t nt1_1, nt2_1;
-    uint32_t nt1_2, nt2_2;
+    uint32_t nt1_1 = 0, nt2_1 = 0;
+    uint32_t nt1_2 = 0, nt2_2 = 0;
 
     LEDsoff();
     LED_A_ON();