diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 30e4d13ece..719bbed8fe 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -3997,4 +3997,13 @@
  */
 //#define MBEDTLS_P256M_EXAMPLE_DRIVER_ENABLED
 
+
+/**
+ * Uncomment to enable using new bignum code in the ECC modules.
+ *
+ * \warning This is currently experimental, incomplete and therefore should not
+ * be used in production.
+ */
+//#define MBEDTLS_ECP_WITH_MPI_UINT
+
 /** \} name SECTION: Module configuration options */
diff --git a/library/ecp_invasive.h b/library/ecp_invasive.h
index db9dee3f47..bb3b127ffe 100644
--- a/library/ecp_invasive.h
+++ b/library/ecp_invasive.h
@@ -40,11 +40,6 @@ typedef enum {
     MBEDTLS_ECP_MOD_SCALAR
 } mbedtls_ecp_modulus_type;
 
-/* Provide a commented-out definition so that `check_names.py` knows that
- * it's not a typo.
- */
-//#define MBEDTLS_ECP_WITH_MPI_UINT
-
 typedef enum {
     MBEDTLS_ECP_VARIANT_NONE = 0,
     MBEDTLS_ECP_VARIANT_WITH_MPI_STRUCT,
diff --git a/scripts/config.py b/scripts/config.py
index 3e957fdd22..4ff5166782 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -195,6 +195,7 @@ EXCLUDE_FROM_FULL = frozenset([
     'MBEDTLS_DEPRECATED_WARNING', # conflicts with deprecated options
     'MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED', # influences the use of ECDH in TLS
     'MBEDTLS_ECP_NO_FALLBACK', # removes internal ECP implementation
+    'MBEDTLS_ECP_WITH_MPI_UINT', # disables the default ECP and is experimental
     'MBEDTLS_ENTROPY_FORCE_SHA256', # interacts with CTR_DRBG_128_BIT_KEY
     'MBEDTLS_HAVE_SSE2', # hardware dependency
     'MBEDTLS_MEMORY_BACKTRACE', # depends on MEMORY_BUFFER_ALLOC_C
@@ -204,6 +205,7 @@ EXCLUDE_FROM_FULL = frozenset([
     'MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES', # removes a feature
     'MBEDTLS_NO_PLATFORM_ENTROPY', # removes a feature
     'MBEDTLS_NO_UDBL_DIVISION', # influences anything that uses bignum
+    'MBEDTLS_P256M_EXAMPLE_DRIVER_ENABLED', # influences SECP256R1 KeyGen/ECDH/ECDSA
     'MBEDTLS_PLATFORM_NO_STD_FUNCTIONS', # removes a feature
     'MBEDTLS_PSA_CRYPTO_CONFIG', # toggles old/new style PSA config
     'MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG', # behavior change + build dependency
@@ -213,11 +215,10 @@ EXCLUDE_FROM_FULL = frozenset([
     'MBEDTLS_RSA_NO_CRT', # influences the use of RSA in X.509 and TLS
     'MBEDTLS_SHA256_USE_A64_CRYPTO_ONLY', # interacts with *_USE_A64_CRYPTO_IF_PRESENT
     'MBEDTLS_SHA512_USE_A64_CRYPTO_ONLY', # interacts with *_USE_A64_CRYPTO_IF_PRESENT
+    'MBEDTLS_SSL_RECORD_SIZE_LIMIT', # in development, currently breaks other tests
     'MBEDTLS_TEST_CONSTANT_FLOW_MEMSAN', # build dependency (clang+memsan)
     'MBEDTLS_TEST_CONSTANT_FLOW_VALGRIND', # build dependency (valgrind headers)
     'MBEDTLS_X509_REMOVE_INFO', # removes a feature
-    'MBEDTLS_SSL_RECORD_SIZE_LIMIT', # in development, currently breaks other tests
-    'MBEDTLS_P256M_EXAMPLE_DRIVER_ENABLED' # influences SECP256R1 KeyGen/ECDH/ECDSA
 ])
 
 def is_seamless_alt(name):
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index b6f6b600c8..c47b767aea 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -1028,8 +1028,9 @@ component_test_default_cmake_gcc_asan () {
 
 component_test_default_cmake_gcc_asan_new_bignum () {
     msg "build: cmake, gcc, ASan" # ~ 1 min 50s
+    scripts/config.py set MBEDTLS_ECP_WITH_MPI_UINT
     CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
-    make CFLAGS="-D MBEDTLS_ECP_WITH_MPI_UINT"
+    make
 
     msg "test: main suites (inc. selftests) (ASan build)" # ~ 50s
     make test
@@ -1086,8 +1087,9 @@ component_test_full_cmake_gcc_asan () {
 component_test_full_cmake_gcc_asan_new_bignum () {
     msg "build: full config, cmake, gcc, ASan"
     scripts/config.py full
+    scripts/config.py set MBEDTLS_ECP_WITH_MPI_UINT
     CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
-    make CFLAGS="-D MBEDTLS_ECP_WITH_MPI_UINT"
+    make
 
     msg "test: main suites (inc. selftests) (full config, ASan build)"
     make test
@@ -1122,8 +1124,9 @@ component_test_full_cmake_gcc_asan_new_bignum_test_hooks () {
     msg "build: full config, cmake, gcc, ASan"
     scripts/config.py full
     scripts/config.py set MBEDTLS_TEST_HOOKS
+    scripts/config.py set MBEDTLS_ECP_WITH_MPI_UINT
     CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
-    make CFLAGS="-DMBEDTLS_ECP_WITH_MPI_UINT"
+    make
 
     msg "test: main suites (inc. selftests) (full config, ASan build)"
     make test
@@ -4212,7 +4215,8 @@ component_test_have_int32_cmake_new_bignum () {
     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 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