diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 13c5c2d79..6a1050042 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -772,7 +772,6 @@ component_test_small_mbedtls_ssl_dtls_max_buffering () {
 component_test_full_cmake_clang () {
     msg "build: cmake, full config, clang" # ~ 50s
     scripts/config.pl full
-    scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
     CC=clang cmake -D CMAKE_BUILD_TYPE:String=Check -D ENABLE_TESTING=On .
     make
 
@@ -842,7 +841,6 @@ component_test_no_use_psa_crypto_full_cmake_asan() {
     # full minus MBEDTLS_USE_PSA_CRYPTO: run the same set of tests as basic-build-test.sh
     msg "build: cmake, full config minus MBEDTLS_USE_PSA_CRYPTO, ASan"
     scripts/config.pl full
-    scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C # slow and makes ASan mostly ineffective
     scripts/config.pl set MBEDTLS_ECP_RESTARTABLE  # not using PSA, so enable restartable ECC
     scripts/config.pl unset MBEDTLS_PSA_CRYPTO_C
     scripts/config.pl unset MBEDTLS_USE_PSA_CRYPTO
@@ -885,7 +883,6 @@ component_test_check_params_without_platform () {
     msg "build+test: MBEDTLS_CHECK_PARAMS without MBEDTLS_PLATFORM_C"
     scripts/config.pl full # includes CHECK_PARAMS
     # Keep MBEDTLS_PARAM_FAILED as assert.
-    scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
     scripts/config.pl unset MBEDTLS_PLATFORM_EXIT_ALT
     scripts/config.pl unset MBEDTLS_PLATFORM_TIME_ALT
     scripts/config.pl unset MBEDTLS_PLATFORM_FPRINTF_ALT
@@ -900,7 +897,6 @@ component_test_check_params_without_platform () {
 component_test_check_params_silent () {
     msg "build+test: MBEDTLS_CHECK_PARAMS with alternative MBEDTLS_PARAM_FAILED()"
     scripts/config.pl full # includes CHECK_PARAMS
-    scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
     # Set MBEDTLS_PARAM_FAILED to nothing.
     sed -i 's/.*\(#define MBEDTLS_PARAM_FAILED( cond )\).*/\1/' "$CONFIG_H"
     make CC=gcc CFLAGS='-Werror -O1' all test
@@ -921,7 +917,6 @@ component_test_no_platform () {
     scripts/config.pl unset MBEDTLS_PLATFORM_TIME_ALT
     scripts/config.pl unset MBEDTLS_PLATFORM_EXIT_ALT
     scripts/config.pl unset MBEDTLS_ENTROPY_NV_SEED
-    scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
     scripts/config.pl unset MBEDTLS_FS_IO
     scripts/config.pl unset MBEDTLS_PSA_CRYPTO_STORAGE_C
     scripts/config.pl unset MBEDTLS_PSA_ITS_FILE_C
@@ -1090,7 +1085,6 @@ component_test_m32_o1 () {
     # Build again with -O1, to compile in the i386 specific inline assembly
     msg "build: i386, make, gcc -O1 (ASan build)" # ~ 30s
     scripts/config.pl full
-    scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C # slow and makes ASan mostly ineffective
     make CC=gcc CFLAGS='-O1 -Werror -Wall -Wextra -m32 -fsanitize=address' LDFLAGS='-m32 -fsanitize=address'
 
     msg "test: i386, make, gcc -O1 (ASan build)"