diff --git a/ci/mynewt_targets/rsa_kw/syscfg.yml b/ci/mynewt_targets/rsa_kw/syscfg.yml
index 4b44287..97dfcb6 100644
--- a/ci/mynewt_targets/rsa_kw/syscfg.yml
+++ b/ci/mynewt_targets/rsa_kw/syscfg.yml
@@ -27,3 +27,4 @@
     BOOTUTIL_USE_TINYCRYPT: 0
     BOOTUTIL_ENCRYPT_KW: 1
     MBEDTLS_NIST_KW_C: 1
+    MBEDTLS_CIPHER_MODE_CTR: 1
diff --git a/ci/mynewt_targets/rsa_rsaoaep/syscfg.yml b/ci/mynewt_targets/rsa_rsaoaep/syscfg.yml
index 649077c..29d7140 100644
--- a/ci/mynewt_targets/rsa_rsaoaep/syscfg.yml
+++ b/ci/mynewt_targets/rsa_rsaoaep/syscfg.yml
@@ -26,3 +26,4 @@
     BOOTUTIL_USE_MBED_TLS: 1
     BOOTUTIL_USE_TINYCRYPT: 0
     BOOTUTIL_ENCRYPT_RSA: 1
+    MBEDTLS_CIPHER_MODE_CTR: 1
diff --git a/ci/mynewt_targets/rsa_rsaoaep_bootstrap/syscfg.yml b/ci/mynewt_targets/rsa_rsaoaep_bootstrap/syscfg.yml
index a2ec074..ddadbbf 100644
--- a/ci/mynewt_targets/rsa_rsaoaep_bootstrap/syscfg.yml
+++ b/ci/mynewt_targets/rsa_rsaoaep_bootstrap/syscfg.yml
@@ -27,3 +27,4 @@
     BOOTUTIL_USE_TINYCRYPT: 0
     BOOTUTIL_ENCRYPT_RSA: 1
     BOOTUTIL_BOOTSTRAP: 1
+    MBEDTLS_CIPHER_MODE_CTR: 1