diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c1ba2e5b743..d0a6303768e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-09-17  Georg-Johann Lay  <avr@gjlay.de>
+
+	PR lto/54598
+	* tree-streamer-in.c (unpack_ts_real_cst_value_fields): Use ggc'ed
+	FIXED_VALUE_TYPE instead of struct fixed_value.
+
 2012-09-17  Georg-Johann Lay  <avr@gjlay.de>
 
 	* config/avr/avr.c (CONST_FIXED_P): Remove define.
diff --git a/gcc/tree-streamer-in.c b/gcc/tree-streamer-in.c
index a38fb470b1f..5f9f7a2fef7 100644
--- a/gcc/tree-streamer-in.c
+++ b/gcc/tree-streamer-in.c
@@ -172,12 +172,11 @@ unpack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 static void
 unpack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 {
-  struct fixed_value fv;
-
-  fv.mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
-  fv.data.low = bp_unpack_var_len_int (bp);
-  fv.data.high = bp_unpack_var_len_int (bp);
-  TREE_FIXED_CST (expr) = fv;
+  FIXED_VALUE_TYPE *fp = ggc_alloc_fixed_value ();
+  fp->mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
+  fp->data.low = bp_unpack_var_len_int (bp);
+  fp->data.high = bp_unpack_var_len_int (bp);
+  TREE_FIXED_CST_PTR (expr) = fp;
 }