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
@@ -1,16 +1,21 @@
 /*
  * MD header for contrib/gdtoa
  *
  * $FreeBSD$
  */
 
 /*
  * NOTE: The definitions in this file must be correct or strtod(3) and
  * floating point formats in printf(3) will break!  The file can be
  * generated by running contrib/gdtoa/arithchk.c on the target
  * 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