diff --git a/web-wasi/Dockerfile.in b/web-wasi/Dockerfile.in
index 3399f44..fa80be8 100644
--- a/web-wasi/Dockerfile.in
+++ b/web-wasi/Dockerfile.in
@@ -26,6 +26,8 @@ ENV AR=${CROSS_ROOT}/bin/llvm-ar \
     CXX=clang++-wasi-sysroot.sh \
     LD=${CROSS_ROOT}/bin/wasm-ld
 
+COPY WASI.cmake /usr/src/
+RUN mv /usr/src/WASI.cmake /usr/share/cmake-*/Modules/Platform/
 COPY Toolchain.cmake ${CROSS_ROOT}/
 ENV CMAKE_TOOLCHAIN_FILE ${CROSS_ROOT}/Toolchain.cmake
 
diff --git a/web-wasi/Toolchain.cmake b/web-wasi/Toolchain.cmake
index bd75c38..74f6395 100644
--- a/web-wasi/Toolchain.cmake
+++ b/web-wasi/Toolchain.cmake
@@ -1,5 +1,3 @@
-set(WASI 1)
-
 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
new file mode 100644
index 0000000..b49713f
--- /dev/null
+++ b/web-wasi/WASI.cmake
@@ -0,0 +1 @@
+set(WASI 1)