diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c
index 50432392..04f43825 100644
--- a/armsrc/iso15693.c
+++ b/armsrc/iso15693.c
@@ -862,7 +862,7 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3
 	uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE];
 
 	// the decoder data structure
-	DecodeReader_t DecodeReader;
+	DecodeReader_t DecodeReader = {0};
 	DecodeReaderInit(received, max_len, &DecodeReader);
 
 	// wait for last transfer to complete