diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d0c5aaac1ac..d8c0c5afe4c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,7 @@
 2001-01-31  Richard Henderson  <rth@redhat.com>
 
+	* config.gcc (alpha-osf5): Use float-i128.h.
+
 	* config/float-i128.h (FLT_EVAL_METHOD, DECIMAL_DIG): Define.
 	* config/float-i32.h: Likewise.
 	* config/float-i64.h: Likewise.
diff --git a/gcc/config.gcc b/gcc/config.gcc
index 19358fbe591..1bbbb4e93f9 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -453,6 +453,7 @@ alpha*-dec-osf*)
 	  *-*-osf5*)
 	    tm_file="${tm_file} alpha/osf.h alpha/osf5.h"
 	    tmake_file="$tmake_file alpha/t-osf4"
+	    float_format=i128
 	    ;;
 	esac
 	case $machine in