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-rw-r--r--bits/mathdef.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/bits/mathdef.h b/bits/mathdef.h
index 0d1c4d7374..3708781597 100644
--- a/bits/mathdef.h
+++ b/bits/mathdef.h
@@ -16,7 +16,7 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
-if !defined _MATH_H && !defined _COMPLEX_H
+#if !defined _MATH_H && !defined _COMPLEX_H
 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
 #endif