diff --git a/libreoffice.spec b/libreoffice.spec
index 27a07c6..24bf5a1 100644
--- a/libreoffice.spec
+++ b/libreoffice.spec
@@ -2975,7 +2975,6 @@ export CXXFLAGS="$CXXFLAGS -Xlinker -lc++ -Xlinker -lc++abi"
 # https://github.com/TRIQS/triqs/issues/523#issuecomment-351960463
 export CXXFLAGS="$CXXFLAGS -D_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR"
 %clang_gcc_wrapper
-export CPP=""
 %else
 %global optflags %{optflags} -Wstrict-aliasing=0
 export ARCH_FLAGS="%{optflags} -fno-omit-frame-pointer -fno-strict-aliasing"