diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a4f4e38ceb5..59711fbdeff 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 Tue Sep 15 22:59:52 1998  Jeffrey A Law  (law@cygnus.com)
 
+	* mn10200.h (ASM_OUTPUT_DWARF2_ADDR_CONST): Define.
+	* mn10300.h (ASM_OUTPUT_DWARF2_ADDR_CONST): Define.
+
 	* combine.c (make_extraction): If no mode is specified for
 	an operand of insv, extv, or extzv, default it to word_mode.
 	(simplify_comparison): Similarly.
diff --git a/gcc/config/mn10200/mn10200.h b/gcc/config/mn10200/mn10200.h
index 796caf295fb..d2b474d5d70 100644
--- a/gcc/config/mn10200/mn10200.h
+++ b/gcc/config/mn10200/mn10200.h
@@ -979,6 +979,10 @@ do { char dstr[30];					\
   ((GET_CODE (X) == PLUS ? OFFSET : 0) \
     + (frame_pointer_needed ? 0 : -total_frame_size ()))
 
+/* We need to prepend underscores.  */
+#define ASM_OUTPUT_DWARF2_ADDR_CONST(FILE,ADDR) \
+  fprintf ((FILE), "\t%s\t_%s", UNALIGNED_WORD_ASM_OP, (ADDR))
+  
 /* Define to use software floating point emulator for REAL_ARITHMETIC and
    decimal <-> binary conversion. */
 #define REAL_ARITHMETIC
diff --git a/gcc/config/mn10300/mn10300.h b/gcc/config/mn10300/mn10300.h
index 6e442691033..e54b77a718b 100644
--- a/gcc/config/mn10300/mn10300.h
+++ b/gcc/config/mn10300/mn10300.h
@@ -975,6 +975,10 @@ do { char dstr[30];					\
     + (frame_pointer_needed \
        ? 0 : -initial_offset (ARG_POINTER_REGNUM, STACK_POINTER_REGNUM)))
 
+/* We need to prepend underscores.  */
+#define ASM_OUTPUT_DWARF2_ADDR_CONST(FILE,ADDR) \
+  fprintf ((FILE), "\t%s\t_%s", UNALIGNED_WORD_ASM_OP, (ADDR))
+
 /* Define to use software floating point emulator for REAL_ARITHMETIC and
    decimal <-> binary conversion. */
 #define REAL_ARITHMETIC