diff --git a/strace.c b/strace.c
index 32a3f5e..914b0a6 100644
--- a/strace.c
+++ b/strace.c
@@ -438,7 +438,7 @@
 	}
 }
 
-#if _LFS64_LARGEFILE
+#ifdef _LARGEFILE64_SOURCE
 # define fopen_for_output fopen64
 # define struct_stat struct stat64
 # define stat_file stat64