diff --git a/src/add-ons/kernel/drivers/network/bcm440x/b44mm.h b/src/add-ons/kernel/drivers/network/bcm440x/b44mm.h
index f1fb739a98..3f250a235b 100644
--- a/src/add-ons/kernel/drivers/network/bcm440x/b44mm.h
+++ b/src/add-ons/kernel/drivers/network/bcm440x/b44mm.h
@@ -41,7 +41,12 @@ typedef vint32 MM_ATOMIC_T;
 #define MM_MEMWRITEL(ptr, val) __raw_writel(val, ptr)
 #define MM_MEMREADL(ptr) __raw_readl(ptr)
 
+#ifdef __INTEL__
 #define mb()    __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory") 
+#else
+#warning no memory barrier function defined.
+#define mb()
+#endif
 #define wmb()    mb()
 
 #define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
diff --git a/src/add-ons/kernel/drivers/network/bcm570x/mm.h b/src/add-ons/kernel/drivers/network/bcm570x/mm.h
index 1193df6ec5..e0d1ff7d07 100644
--- a/src/add-ons/kernel/drivers/network/bcm570x/mm.h
+++ b/src/add-ons/kernel/drivers/network/bcm570x/mm.h
@@ -41,7 +41,12 @@ typedef vint32 MM_ATOMIC_T;
 #define MM_MEMWRITEL(ptr, val) __raw_writel(val, ptr)
 #define MM_MEMREADL(ptr) __raw_readl(ptr)
 
+#ifdef __INTEL__
 #define mb()    __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory") 
+#else
+#warning no memory barrier function defined.
+#define mb()	
+#endif
 #define wmb()    mb()
 #define rmb()    mb()