diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index 7ca00053861..aa2795a3a6e 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -2210,7 +2210,9 @@ build_new_1 (exp)
     {
       tree extra = BI_header_size;
 
+      susp = suspend_momentary ();
       size = size_binop (PLUS_EXPR, size, extra);
+      resume_momentary (susp);
     }
 
   if (has_array)