diff --git a/src/build.sh b/src/build.sh
index 8d6bea83f2..1e01b29827 100755
--- a/src/build.sh
+++ b/src/build.sh
@@ -115,6 +115,6 @@ mkdir -p out
 
 export DEPOT_TOOLS_WIN_TOOLCHAIN=0
 
-./gn/out/gn gen "$out" --args="$flags $EXTRA_FLAGS" --script-executable=$PYTHON
+./gn/out/gn gen "$out" --args="$flags $EXTRA_FLAGS"
 
 ninja -C "$out" naive
diff --git a/src/get-sysroot.sh b/src/get-sysroot.sh
index ae9a98e8b2..b4822c7fc4 100644
--- a/src/get-sysroot.sh
+++ b/src/get-sysroot.sh
@@ -24,7 +24,11 @@ if [ ! "$target_cpu" ]; then
   target_cpu="$host_cpu"
 fi
 
-PYTHON=$(which python3 2>/dev/null || which python 2>/dev/null)
+if which python3 2>/dev/null; then
+  PYTHON=python3
+else
+  PYTHON=python
+fi
 
 # sysroot
 case "$target_os" in