diff --git a/packages/z3/build.sh b/packages/z3/build.sh
index 744ba94cc..01be7a962 100644
--- a/packages/z3/build.sh
+++ b/packages/z3/build.sh
@@ -10,8 +10,7 @@ termux_step_configure() {
 	_PYTHON_VERSION=$(source $TERMUX_SCRIPTDIR/packages/python/build.sh; echo $_MAJOR_VERSION)
 
 	chmod +x scripts/mk_make.py
-	sed '1 s/^.#*$/\#\!\/usr\/bin\/env\ python${_PYTHON_VERSION}/g' -i scripts/mk_make.py
-	CXX="$CXX" CC="$CC" scripts/mk_make.py --prefix=$TERMUX_PREFIX --build=$TERMUX_PKG_BUILDDIR
-	sed 's/..\/..\/..\/..\/..\///g' -i Makefile
+	CXX="$CXX" CC="$CC" python${_PYTHON_VERSION} scripts/mk_make.py --prefix=$TERMUX_PREFIX --build=$TERMUX_PKG_BUILDDIR
+	sed 's%../../../../../%%g' -i Makefile
 	sed 's/\-lpthread//g' -i config.mk
 }