diff --git a/libewf.spec b/libewf.spec
index 1866ed9..a647884 100644
--- a/libewf.spec
+++ b/libewf.spec
@@ -35,6 +35,7 @@ Source23:       Expert_Witness_Compression_Format_2_EWF2.pdf
 Patch1:         remove_date_time_macros.patch
 Patch2:         system-libs.patch
 BuildRequires:  %{python_module devel}
+BuildRequires:  autoconf >= 2.71
 BuildRequires:  bison
 BuildRequires:  c_compiler
 BuildRequires:  flex