diff --git a/c/src/lib/libcpu/powerpc/ChangeLog b/c/src/lib/libcpu/powerpc/ChangeLog
index 16d3d312e9..a81252e311 100644
--- a/c/src/lib/libcpu/powerpc/ChangeLog
+++ b/c/src/lib/libcpu/powerpc/ChangeLog
@@ -1,3 +1,8 @@
+2011-02-11	Ralf Corsépius <ralf.corsepius@rtems.org>
+
+	* mpc55xx/include/mpc55xx.h:
+	Use "__asm__" instead of "asm" for improved c99-compliance.
+
 2011-02-11	Ralf Corsépius <ralf.corsepius@rtems.org>
 
 	* mpc6xx/altivec/vec_sup.c, mpc6xx/mmu/bat.h:
diff --git a/c/src/lib/libcpu/powerpc/mpc55xx/include/mpc55xx.h b/c/src/lib/libcpu/powerpc/mpc55xx/include/mpc55xx.h
index 80f1ce32b8..4cd6abab8b 100644
--- a/c/src/lib/libcpu/powerpc/mpc55xx/include/mpc55xx.h
+++ b/c/src/lib/libcpu/powerpc/mpc55xx/include/mpc55xx.h
@@ -94,7 +94,7 @@ static inline size_t mpc55xx_cache_aligned_size( const void *s, size_t n)
 static inline uint32_t mpc55xx_count_leading_zeros( uint32_t value)
 {
 	uint32_t count;
-	asm (
+	__asm__ (
 		"cntlzw %0, %1;"
 		: "=r" (count)
 		: "r" (value)