diff --git a/vars/build.vars b/vars/build.vars
index 9696f98..83d949d 100644
--- a/vars/build.vars
+++ b/vars/build.vars
@@ -1152,7 +1152,7 @@ bdwgc bison chicken cparser diffutils flex lunix m4 make mandoc patch patchutils
 : ${PKG_PYTHON2_BASE_DIR:=${BUILD_WORKDIR}/python2-native-${DEFAULT_TARGET}};
 : ${PKG_PYTHON2_BUILD_DIR:=build/python2};
 : ${PKG_PYTHON2_CONFIGURE:=build/sbpython2/configure};
-: ${PKG_PYTHON2_CONFIGURE_ARGS:="--source-dir=../../Python-${PKG_PYTHON2_VERSION} --sysroot=${PREFIX_NATIVE} --prefix= --target=${DEFAULT_TARGET}"};
+: ${PKG_PYTHON2_CONFIGURE_ARGS:="--source-dir=../../Python-${PKG_PYTHON2_VERSION} --sysroot=${PREFIX_NATIVE} --prefix=/ --target=${DEFAULT_TARGET}"};
 : ${PKG_PYTHON3_SHA256SUM:=ab6193af1921b30f587b302fe385268510e80187ca83ca82d2bfe7ab544c6f91};
 : ${PKG_PYTHON3_VERSION:=3.6.3};
 : ${PKG_PYTHON3_URL:="https://www.python.org/ftp/python/${PKG_PYTHON3_VERSION}/Python-${PKG_PYTHON3_VERSION}.tgz"};
@@ -1160,7 +1160,7 @@ bdwgc bison chicken cparser diffutils flex lunix m4 make mandoc patch patchutils
 : ${PKG_PYTHON3_BASE_DIR:=${BUILD_WORKDIR}/python3-native-${DEFAULT_TARGET}};
 : ${PKG_PYTHON3_BUILD_DIR:=build/python3};
 : ${PKG_PYTHON3_CONFIGURE:=build/sbpython3/configure};
-: ${PKG_PYTHON3_CONFIGURE_ARGS:="--source-dir=../../Python-${PKG_PYTHON3_VERSION} --sysroot=${PREFIX_NATIVE} --prefix= --target=${DEFAULT_TARGET}"};
+: ${PKG_PYTHON3_CONFIGURE_ARGS:="--source-dir=../../Python-${PKG_PYTHON3_VERSION} --sysroot=${PREFIX_NATIVE} --prefix=/ --target=${DEFAULT_TARGET}"};
 : ${PKG_PYTHON3_INSTALL_FILES:="@python3=bin/python"};
 : ${PKG_PYTHON3_SUBDIR:=Python-${PKG_PYTHON3_VERSION}};
 : ${PKG_RUBY_SHA256SUM:=ba5ba60e5f1aa21b4ef8e9bf35b9ddb57286cb546aac4b5a28c71f459467e507};