diff --git a/crypto/gnutls/CMakeLists.txt b/crypto/gnutls/CMakeLists.txt
index 575fc3febde9b6a4e6cdce3a7c80e718c9e0e986..7e5654023967e836ec1f75b0d00f0ce103a2ded2 100644
--- a/crypto/gnutls/CMakeLists.txt
+++ b/crypto/gnutls/CMakeLists.txt
@@ -34,6 +34,8 @@ set(ngtcp2_crypto_gnutls_INCLUDE_DIRS
   "${CMAKE_CURRENT_SOURCE_DIR}/../../lib"
   "${CMAKE_CURRENT_SOURCE_DIR}/../../crypto/includes"
   "${CMAKE_CURRENT_BINARY_DIR}/../../crypto/includes"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../../crypto"
+  "${CMAKE_CURRENT_BINARY_DIR}/../../crypto"
   "${GNUTLS_INCLUDE_DIRS}"
 )
 
diff --git a/crypto/openssl/CMakeLists.txt b/crypto/openssl/CMakeLists.txt
index a12d93aa959addb517ea3811387454bbaf845df2..f590d11090f50fa30dedce513476fcc2b8b60ade 100644
--- a/crypto/openssl/CMakeLists.txt
+++ b/crypto/openssl/CMakeLists.txt
@@ -34,6 +34,8 @@ set(ngtcp2_crypto_openssl_INCLUDE_DIRS
   "${CMAKE_CURRENT_SOURCE_DIR}/../../lib"
   "${CMAKE_CURRENT_SOURCE_DIR}/../../crypto/includes"
   "${CMAKE_CURRENT_BINARY_DIR}/../../crypto/includes"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../../crypto"
+  "${CMAKE_CURRENT_BINARY_DIR}/../../crypto"
   "${OPENSSL_INCLUDE_DIRS}"
 )