diff --git a/.github/workflows/pnnx.yml b/.github/workflows/pnnx.yml
index 28e6540efd0..ac11429636f 100644
--- a/.github/workflows/pnnx.yml
+++ b/.github/workflows/pnnx.yml
@@ -46,7 +46,7 @@ jobs:
       run: |
         cd tools/pnnx
         mkdir build && cd build
-        cmake -DCMAKE_BUILD_TYPE=Release ..
+        cmake -DCMAKE_BUILD_TYPE=Release -DPython3_ROOT_DIR="${{ env.pythonLocation }}" ..
         cmake --build . -j 4
 
     - name: quick-test
diff --git a/tools/pnnx/CMakeLists.txt b/tools/pnnx/CMakeLists.txt
index a2f47dfbdea..65b15a3cf52 100644
--- a/tools/pnnx/CMakeLists.txt
+++ b/tools/pnnx/CMakeLists.txt
@@ -38,8 +38,6 @@ option(PNNX_COVERAGE "build for coverage" OFF)
 # set(Torch_DIR "${Torch_INSTALL_DIR}/share/cmake/Torch")
 set(TorchVision_DIR "${TorchVision_INSTALL_DIR}/share/cmake/TorchVision")
 
-set(Python_FIND_REGISTRY "LAST")
-set(Python_FIND_FRAMEWORK "LAST")
 find_package(Python3 COMPONENTS Interpreter Development)
 
 PNNXProbeForPyTorchInstall()