diff --git a/web-wasi/Toolchain.cmake b/web-wasi/Toolchain.cmake
index 74f6395..1e747bb 100644
--- a/web-wasi/Toolchain.cmake
+++ b/web-wasi/Toolchain.cmake
@@ -1,3 +1,4 @@
+set(WASI_SDK_PREFIX $ENV{WASI_SDK_PATH})
 include($ENV{WASI_SDK_PATH}/share/cmake/wasi-sdk.cmake)
 
 set(CMAKE_FIND_ROOT_PATH $ENV{CROSS_ROOT})
diff --git a/web-wasi/WASI.cmake b/web-wasi/WASI.cmake
index b49713f..8bb6cb7 100644
--- a/web-wasi/WASI.cmake
+++ b/web-wasi/WASI.cmake
@@ -1 +1,2 @@
 set(WASI 1)
+set(UNIX 1)