diff --git a/include/proxmark3.h b/include/proxmark3.h
index 002c7db36..4532baf09 100644
--- a/include/proxmark3.h
+++ b/include/proxmark3.h
@@ -53,8 +53,11 @@
 #define UDP_CSR_BYTES_RECEIVED(x)				(((x) >> 16) & 0x7ff)
 //**************************************************************
 
-#define LOW(x)	 AT91C_BASE_PIOA->PIO_CODR = (x)
-#define HIGH(x)	 AT91C_BASE_PIOA->PIO_SODR = (x)
+
+
+#define LOW(x)	 AT91C_BASE_PIOA->PIO_CODR |= (x)
+#define HIGH(x)	 AT91C_BASE_PIOA->PIO_SODR |= (x)
+
 #define GETBIT(x) (AT91C_BASE_PIOA->PIO_ODSR & (x)) ? 1:0
 #define SETBIT(x, y) (y) ? (HIGH(x)):(LOW(x))
 #define INVBIT(x) SETBIT((x), !(GETBIT(x)))