diff --git a/src/drivers/net/ath/ath.h b/src/drivers/net/ath/ath.h
index d6a03739..589bb563 100644
--- a/src/drivers/net/ath/ath.h
+++ b/src/drivers/net/ath/ath.h
@@ -26,7 +26,6 @@ FILE_LICENCE ( BSD2 );
 #include <ipxe/net80211.h>
 
 /* This block of functions are from kernel.h v3.0.1 */
-#define ARRAY_SIZE(arr)		(sizeof(arr) / sizeof((arr)[0]))
 #define DIV_ROUND_UP(n,d)	(((n) + (d) - 1) / (d))
 #define BITS_PER_BYTE		8
 #define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
diff --git a/src/drivers/net/ath/ath5k/ath5k.h b/src/drivers/net/ath/ath5k/ath5k.h
index 30e2024c..fa62e8ce 100644
--- a/src/drivers/net/ath/ath5k/ath5k.h
+++ b/src/drivers/net/ath/ath5k/ath5k.h
@@ -34,8 +34,6 @@ FILE_LICENCE ( MIT );
 #undef ERRFILE
 #define ERRFILE ERRFILE_ath5k
 
-#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
-
 /* RX/TX descriptor hw structs */
 #include "desc.h"
 
diff --git a/src/drivers/net/forcedeth.h b/src/drivers/net/forcedeth.h
index e1cf6f71..3a372dc1 100644
--- a/src/drivers/net/forcedeth.h
+++ b/src/drivers/net/forcedeth.h
@@ -36,8 +36,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #ifndef _FORCEDETH_H_
 #define _FORCEDETH_H_
 
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
 struct ring_desc {
 	u32 buf;
 	u32 flaglen;
diff --git a/src/drivers/net/pcnet32.h b/src/drivers/net/pcnet32.h
index 5e4492ef..f06d7fd0 100644
--- a/src/drivers/net/pcnet32.h
+++ b/src/drivers/net/pcnet32.h
@@ -23,8 +23,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #ifndef _PCNET32_H_
 #define _PCNET32_H_
 
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
 /*
  * Set the number of Tx and Rx buffers, using Log_2(# buffers).
  * Set default values to 16 Tx buffers and 32 Rx buffers.
diff --git a/src/drivers/net/rtl818x/rtl8185_rtl8225.c b/src/drivers/net/rtl818x/rtl8185_rtl8225.c
index ae92531c..31a740e6 100644
--- a/src/drivers/net/rtl818x/rtl8185_rtl8225.c
+++ b/src/drivers/net/rtl818x/rtl8185_rtl8225.c
@@ -30,7 +30,6 @@ FILE_LICENCE(GPL2_ONLY);
 #define RTL8225_ANAPARAM2_OFF	0x840dec11
 
 #define min(a,b) (((a)<(b))?(a):(b))
-#define ARRAY_SIZE(a) (int)(sizeof(a)/sizeof((a)[0]))
 
 static inline void rtl8225_write_phy_ofdm(struct net80211_device *dev,
 					  u8 addr, u8 data)
@@ -323,7 +322,7 @@ static void rtl8225_rf_set_tx_power(struct net80211_device *dev, int channel)
 static void rtl8225_rf_init(struct net80211_device *dev)
 {
 	struct rtl818x_priv *priv = dev->priv;
-	int i;
+	unsigned int i;
 
 	rtl818x_set_anaparam(priv, RTL8225_ANAPARAM_ON);
 
@@ -552,7 +551,7 @@ static const u16 rtl8225z2_rxgain[] = {
 static void rtl8225z2_rf_init(struct net80211_device *dev)
 {
 	struct rtl818x_priv *priv = dev->priv;
-	int i;
+	unsigned int i;
 
 	rtl818x_set_anaparam(priv, RTL8225_ANAPARAM_ON);
 
diff --git a/src/drivers/net/skge.h b/src/drivers/net/skge.h
index d9e91457..b13013bb 100755
--- a/src/drivers/net/skge.h
+++ b/src/drivers/net/skge.h
@@ -65,9 +65,6 @@ FILE_LICENCE ( GPL2_ONLY );
 #define SUPPORTED_TP			(1 << 7)
 #define SUPPORTED_FIBRE			(1 << 10)
 
-/* from kernel.h */
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
 /* ----------------------------------- */
 
 #define PCI_STATUS_ERROR_BITS (PCI_STATUS_DETECTED_PARITY | \
diff --git a/src/drivers/net/tg3/tg3.h b/src/drivers/net/tg3/tg3.h
index be02c571..05d51634 100644
--- a/src/drivers/net/tg3/tg3.h
+++ b/src/drivers/net/tg3/tg3.h
@@ -3284,8 +3284,6 @@ struct tg3 {
 	u16				subsystem_device;
 };
 
-#define ARRAY_SIZE(x) ( sizeof(x) / sizeof((x)[0]) )
-
 #define TG3_TX_RING_SIZE		512
 #define TG3_DEF_TX_RING_PENDING		(TG3_TX_RING_SIZE - 1)
 
diff --git a/src/drivers/net/vxge/vxge_config.h b/src/drivers/net/vxge/vxge_config.h
index bf25134a..59e8a796 100644
--- a/src/drivers/net/vxge/vxge_config.h
+++ b/src/drivers/net/vxge/vxge_config.h
@@ -27,10 +27,6 @@ FILE_LICENCE(GPL2_ONLY);
 
 #define WAIT_FACTOR          1
 
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(a)  (sizeof(a) / sizeof((a)[0]))
-#endif
-
 #define VXGE_HW_MAC_MAX_WIRE_PORTS      2
 #define VXGE_HW_MAC_MAX_AGGR_PORTS      2
 #define VXGE_HW_MAC_MAX_PORTS           3
diff --git a/src/include/compiler.h b/src/include/compiler.h
index 4924c7ef..56a5f63d 100644
--- a/src/include/compiler.h
+++ b/src/include/compiler.h
@@ -655,6 +655,13 @@ char __debug_disable(OBJECT) = ( DBGLVL_MAX & ~DBGLVL_DFLT );
 #define barrier() __asm__ __volatile__ ( "" : : : "memory" )
 #endif /* ASSEMBLY */
 
+/**
+ * Array size
+ */
+#ifndef ASSEMBLY
+#define ARRAY_SIZE(array) ( sizeof (array) / sizeof ( (array)[0] ) )
+#endif /* ASSEMBLY */
+
 /**
  * @defgroup licences Licence declarations
  *