diff --git a/libhangul.spec b/libhangul.spec
index 654f718..ff6afd5 100644
--- a/libhangul.spec
+++ b/libhangul.spec
@@ -27,9 +27,9 @@ providing Hangul input.
 
 %prep
 %setup -q
-autoreconf -fi
 
 %build
+autoreconf -fi
 %configure --disable-static
 
 make %{?_smp_mflags}