--- a/hwaccess.c
+++ b/hwaccess.c
@@ -71,7 +71,7 @@ static inline void sync_primitive(void)
  * See also https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/memory-barriers.txt
  */
 #if IS_PPC // cf. http://lxr.free-electrons.com/source/arch/powerpc/include/asm/barrier.h
-	asm("eieio" : : : "memory");
+	__asm__ ("eieio" : : : "memory");
 #elif IS_SPARC
 #if defined(__sparc_v9__) || defined(__sparcv9)
 	/* Sparc V9 CPUs support three different memory orderings that range from x86-like TSO to PowerPC-like
