diff --git a/lib/libc/arm/arith.h b/lib/libc/arm/arith.h
index 86121bf9a80c..e6f1da00a4cb 100644
--- a/lib/libc/arm/arith.h
+++ b/lib/libc/arm/arith.h
@@ -11,6 +11,11 @@
  * architecture.  See contrib/gdtoa/gdtoaimp.h for details.
  */
 
+#ifndef __ARMEB__
 #define IEEE_8087
 #define Arith_Kind_ASL 1
 #define Sudden_Underflow
+#else
+#define IEEE_MC68k
+#define Arith_Kind_ASL 2
+#endif