diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 0f493ac..4523692 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -922,6 +922,8 @@
     msg "build: default config, no peer CRT, on-demand CRT parsing (ASan build)"
     scripts/config.pl unset MBEDTLS_SSL_KEEP_PEER_CERTIFICATE
     scripts/config.pl set MBEDTLS_X509_ON_DEMAND_PARSING
+    scripts/config.pl set MBEDTLS_THREADING_C
+    scripts/config.pl set MBEDTLS_THREADING_PTHREAD
     CC=gcc cmake -D CMAKE_BUILD_TYPE:String=Asan .
     make