diff --git a/project/hoppla.sh b/project/hoppla.sh
index 5e55b3f..cd53fc7 100755
--- a/project/hoppla.sh
+++ b/project/hoppla.sh
@@ -90,6 +90,7 @@ for py_ver in $py_base_ver $py_curr_ver; do
 			      -e 's@-Wno-unused-result@@g' \
 			      -e 's@-Wsign-compare@@g' \
 			      -e 's@-DNDEBUGe@@g' \
+			      -e 's@-DPy_BUILD_CORE_BUILTIN@@g' \
 			      -e 's@-DPy_BUILD_CORE@@g' \
 			      -e 's@-g -fwrapv -O3 -Wall@@g' \
 			      -e 's@-std=c99 -Wextra@@g' \