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-rw-r--r--libio/iofopen.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libio/iofopen.c b/libio/iofopen.c
index d6f59497b4..2ea82e2091 100644
--- a/libio/iofopen.c
+++ b/libio/iofopen.c
@@ -33,7 +33,7 @@
 _IO_FILE *
 __fopen_maybe_mmap (_IO_FILE *fp)
 {
-#ifdef _G_HAVE_MMAP
+#if _G_HAVE_MMAP
   if ((fp->_flags2 & _IO_FLAGS2_MMAP) && (fp->_flags & _IO_NO_WRITES))
     {
       /* Since this is read-only, we might be able to mmap the contents