diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1a9aab7ded..59204f45e5 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2003-06-03  J. Brobecker  <brobecker@gnat.com>
+
+	* config/alpha/alpha-osf1.mt (TDEPFILES): Add alpha-mdebug-tdep.o.
+	* alpha-osf1-tdep.c (alpha_osf1_init_abi): Enable the mdebug module.
+
 2003-06-03  J. Brobecker  <brobecker@gnat.com>
 
 	* alpha-osf1-tdep.c (alpha_osf1_sigcontext_addr): Replace
diff --git a/gdb/alpha-osf1-tdep.c b/gdb/alpha-osf1-tdep.c
index 8cd112df56..ca757de660 100644
--- a/gdb/alpha-osf1-tdep.c
+++ b/gdb/alpha-osf1-tdep.c
@@ -75,6 +75,9 @@ alpha_osf1_init_abi (struct gdbarch_info info,
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
+  /* Hook into the MDEBUG frame unwinder.  */
+  alpha_mdebug_init_abi (info, gdbarch);
+
   set_gdbarch_pc_in_sigtramp (gdbarch, alpha_osf1_pc_in_sigtramp);
   /* The next/step support via procfs on OSF1 is broken when running
      on multi-processor machines. We need to use software single stepping
diff --git a/gdb/config/alpha/alpha-osf1.mt b/gdb/config/alpha/alpha-osf1.mt
index 29212c9a95..2a47bd4142 100644
--- a/gdb/config/alpha/alpha-osf1.mt
+++ b/gdb/config/alpha/alpha-osf1.mt
@@ -1,3 +1,3 @@
 # Target: Little-endian Alpha
-TDEPFILES= alpha-tdep.o alpha-osf1-tdep.o
+TDEPFILES= alpha-tdep.o alpha-osf1-tdep.o alpha-mdebug-tdep.o
 TM_FILE= tm-alpha.h