diff --git a/boot/zephyr/CMakeLists.txt b/boot/zephyr/CMakeLists.txt
index ded117d..f5e02c7 100644
--- a/boot/zephyr/CMakeLists.txt
+++ b/boot/zephyr/CMakeLists.txt
@@ -66,7 +66,7 @@
 set(FIAT_DIR "${MCUBOOT_DIR}/ext/fiat")
 assert_exists(FIAT_DIR)
 # Path to mbed-tls' asn1 parser library.
-set(MBEDTLS_ASN1_DIR "${MCUBOOT_DIR}/ext/mbedtls")
+set(MBEDTLS_ASN1_DIR "${MCUBOOT_DIR}/ext/mbedtls-asn1")
 assert_exists(MBEDTLS_ASN1_DIR)
 set(NRF_DIR "${MCUBOOT_DIR}/ext/nrf")