diff --git a/build-js.sh b/build-js.sh
index 26d5f44663a..e15a209b478 100755
--- a/build-js.sh
+++ b/build-js.sh
@@ -73,7 +73,7 @@ OUT="$PWD/out"
 
 echo "generate embedded intrinsics module"
 
-python $BINARYEN_SCRIPTS/embedwast.py $BINARYEN_SRC/passes/wasm-intrinsics.wast $BINARYEN_SRC/passes/WasmIntrinsics.cpp
+python3 $BINARYEN_SCRIPTS/embedwast.py $BINARYEN_SRC/passes/wasm-intrinsics.wast $BINARYEN_SRC/passes/WasmIntrinsics.cpp
 
 echo "compiling source files"
 
diff --git a/src/passes/CMakeLists.txt b/src/passes/CMakeLists.txt
index cb51ea55aa3..604913ba9fb 100644
--- a/src/passes/CMakeLists.txt
+++ b/src/passes/CMakeLists.txt
@@ -1,6 +1,6 @@
 add_custom_command(
   OUTPUT WasmIntrinsics.cpp
-  COMMAND python ${PROJECT_SOURCE_DIR}/scripts/embedwast.py ${PROJECT_SOURCE_DIR}/src/passes/wasm-intrinsics.wast ${CMAKE_CURRENT_BINARY_DIR}/WasmIntrinsics.cpp
+  COMMAND python3 ${PROJECT_SOURCE_DIR}/scripts/embedwast.py ${PROJECT_SOURCE_DIR}/src/passes/wasm-intrinsics.wast ${CMAKE_CURRENT_BINARY_DIR}/WasmIntrinsics.cpp
   DEPENDS ${PROJECT_SOURCE_DIR}/scripts/embedwast.py wasm-intrinsics.wast)
 
 SET(passes_SOURCES