diff --git a/libc/arch-arm/include/machine/cpu-features.h b/libc/arch-arm/include/machine/cpu-features.h
index ecf6ff6..5af325b 100644
--- a/libc/arch-arm/include/machine/cpu-features.h
+++ b/libc/arch-arm/include/machine/cpu-features.h
@@ -149,11 +149,11 @@
 #  define __ARM_HAVE_PC_INTERWORK
 #endif
 
-/* define _ARM_HAVE_LDREX_STREX for ARMv6 and ARMv7 architecure to be
+/* define __ARM_HAVE_LDREX_STREX for ARMv6 and ARMv7 architecure to be
  * used in replacement of depricated swp instruction
  */
 #if __ARM_ARCH__ >= 6
-#  define _ARM_HAVE_LDREX_STREX
+#  define __ARM_HAVE_LDREX_STREX
 #endif