diff --git a/tests/subsys/jwt/testcase.yaml b/tests/subsys/jwt/testcase.yaml
index 9a7a547f56b..52cc9086fd6 100644
--- a/tests/subsys/jwt/testcase.yaml
+++ b/tests/subsys/jwt/testcase.yaml
@@ -19,6 +19,7 @@ tests:
       # source.
       - CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG=y
       - CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG_ALLOW_NON_CSPRNG=y
+      - CONFIG_MBEDTLS_ENABLE_HEAP=y
   libraries.encoding.jwt.rsa.legacy:
     filter: CSPRNG_ENABLED
     extra_configs:
@@ -31,3 +32,6 @@ tests:
       # source.
       - CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG=y
       - CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG_ALLOW_NON_CSPRNG=y
+      - CONFIG_PSA_WANT_RSA_KEY_SIZE_2048=y
+      - CONFIG_MBEDTLS_ENABLE_HEAP=y
+      - CONFIG_MBEDTLS_HEAP_SIZE=8192