diff --git a/netcdf4-python.spec b/netcdf4-python.spec
index 71d220c..f481961 100644
--- a/netcdf4-python.spec
+++ b/netcdf4-python.spec
@@ -32,6 +32,8 @@ BuildRequires:  numpy
 %if 0%{?with_python3}
 BuildRequires:  python3-devel
 BuildRequires:  python3-numpy
+# For 2to3
+BuildRequires:  python-tools
 %endif # if with_python3
 BuildRequires:  netcdf-devel
 
@@ -95,6 +97,7 @@ containing vlens, and vlens containing compound types) are not supported.
 %if 0%{?with_python3}
 rm -rf %{py3dir}
 cp -a . %{py3dir}
+2to3 --write --nobackups %{py3dir}
 find %{py3dir} -name '*.py' | xargs sed -i '1s|^#!python|#!%{__python3}|'
 %endif # with_python3