diff --git a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
index 13c6f38737c..d73b9f1e33f 100644
--- a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
+++ b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
@@ -22,7 +22,7 @@ if {![dwarf2_support]} {
 
 standard_testfile .c -dbg.S
 
-set asm_file $srcfile2
+set asm_file [standard_output_file $srcfile2]
 set opts {}
 
 if  { [gdb_compile ${srcdir}/${subdir}/${srcfile} ${binfile}1.o \