diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 71e2332..a1dcb8d 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -4216,7 +4216,8 @@
     scripts/config.py unset MBEDTLS_PADLOCK_C
     scripts/config.py unset MBEDTLS_AESCE_C
     scripts/config.py set MBEDTLS_TEST_HOOKS
-    make CC=gcc CFLAGS="$ASAN_CFLAGS -Werror -Wall -Wextra -DMBEDTLS_HAVE_INT32 -DMBEDTLS_ECP_WITH_MPI_UINT" LDFLAGS="$ASAN_CFLAGS"
+    scripts/config.py -f "$CONFIG_NEW_BIGNUM_H" set MBEDTLS_ECP_WITH_MPI_UINT
+    make CC=gcc CFLAGS="$ASAN_CFLAGS -Werror -Wall -Wextra -DMBEDTLS_HAVE_INT32" LDFLAGS="$ASAN_CFLAGS"
 
     msg "test: gcc, force 32-bit bignum limbs, new bignum interface, test hooks (ASan build)"
     make test