diff --git a/bin/pyenv-virtualenv b/bin/pyenv-virtualenv
index 382f13a..90aa712 100755
--- a/bin/pyenv-virtualenv
+++ b/bin/pyenv-virtualenv
@@ -157,7 +157,7 @@ build_package_ez_setup() {
       http get "${EZ_SETUP_URL}"
     fi
   } 1> "${ez_setup}"
-  pyenv-exec python "${ez_setup}" ${EZ_SETUP_OPTS} 1>&2 || {
+  pyenv-exec python -s "${ez_setup}" ${EZ_SETUP_OPTS} 1>&2 || {
     echo "error: failed to install setuptools via ez_setup.py" >&2
     return 1
   }
@@ -175,14 +175,14 @@ build_package_get_pip() {
       http get "${GET_PIP_URL}"
     fi
   } 1> "${get_pip}"
-  pyenv-exec python "${get_pip}" ${GET_PIP_OPTS} 1>&2 || {
+  pyenv-exec python -s "${get_pip}" ${GET_PIP_OPTS} 1>&2 || {
     echo "error: failed to install pip via get-pip.py" >&2
     return 1
   }
 }
 
 build_package_ensurepip() {
-  pyenv-exec python -m ensurepip 2>/dev/null || build_package_get_pip "$@" || return 1
+  pyenv-exec python -s -m ensurepip 2>/dev/null || build_package_get_pip "$@" || return 1
 }
 
 prepare_requirements() {
diff --git a/test/pip.bats b/test/pip.bats
index 909a0f3..b7337d5 100644
--- a/test/pip.bats
+++ b/test/pip.bats
@@ -26,7 +26,7 @@ unstub_pyenv() {
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pyvenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";mkdir -p \${PYENV_ROOT}/versions/venv/bin"
-  stub pyenv-exec "python -m ensurepip : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";touch \${PYENV_ROOT}/versions/venv/bin/pip"
+  stub pyenv-exec "python -s -m ensurepip : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";touch \${PYENV_ROOT}/versions/venv/bin/pip"
 
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
@@ -36,7 +36,7 @@ unstub_pyenv() {
   assert_success
   assert_output <<OUT
 PYENV_VERSION=3.4.1 pyvenv ${PYENV_ROOT}/versions/venv
-PYENV_VERSION=venv python -m ensurepip
+PYENV_VERSION=venv python -s -m ensurepip
 rehashed
 OUT
   assert [ -e "${PYENV_ROOT}/versions/venv/bin/pip" ]
@@ -51,8 +51,8 @@ OUT
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pyvenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";mkdir -p \${PYENV_ROOT}/versions/venv/bin"
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";touch \${PYENV_ROOT}/versions/venv/bin/pip"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";touch \${PYENV_ROOT}/versions/venv/bin/pip"
   stub curl true
 
   remove_executable "3.3.5" "virtualenv"
@@ -64,7 +64,7 @@ OUT
   assert_output <<OUT
 PYENV_VERSION=3.3.5 pyvenv ${PYENV_ROOT}/versions/venv
 Installing pip from https://bootstrap.pypa.io/get-pip.py...
-PYENV_VERSION=venv python ${TMP}/pyenv/cache/get-pip.py
+PYENV_VERSION=venv python -s ${TMP}/pyenv/cache/get-pip.py
 rehashed
 OUT
   assert [ -e "${PYENV_ROOT}/versions/venv/bin/pip" ]
diff --git a/test/pyvenv.bats b/test/pyvenv.bats
index 93ffd2c..a24479b 100644
--- a/test/pyvenv.bats
+++ b/test/pyvenv.bats
@@ -26,7 +26,7 @@ unstub_pyenv() {
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pyvenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : true"
+  stub pyenv-exec "python -s -m ensurepip : true"
 
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
@@ -49,7 +49,7 @@ OUT
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "virtualenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : true"
+  stub pyenv-exec "python -s -m ensurepip : true"
 
   create_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
@@ -73,8 +73,8 @@ OUT
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : true"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
   remove_executable "3.2.1" "virtualenv"
@@ -102,7 +102,7 @@ OUT
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv --python=python3 ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : true"
+  stub pyenv-exec "python -s -m ensurepip : true"
 
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
@@ -127,7 +127,7 @@ OUT
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv --python=python3 ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : true"
+  stub pyenv-exec "python -s -m ensurepip : true"
 
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
@@ -152,8 +152,8 @@ OUT
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PIP_REQUIRE_VENV=\${PIP_REQUIRE_VENV} PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv ${PYENV_ROOT}/versions/venv : echo PIP_REQUIRE_VENV=\${PIP_REQUIRE_VENV} PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : true"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
   remove_executable "3.2.1" "virtualenv"
diff --git a/test/virtualenv.bats b/test/virtualenv.bats
index ec8622f..e169430 100644
--- a/test/virtualenv.bats
+++ b/test/virtualenv.bats
@@ -27,8 +27,8 @@ unstub_pyenv() {
   export PYENV_VERSION="3.2.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-exec "virtualenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : true"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
   run pyenv-virtualenv "3.2.1" "venv"
@@ -50,8 +50,8 @@ OUT
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-version-name "echo \${PYENV_VERSION}"
   stub pyenv-exec "virtualenv ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : true"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
   run pyenv-virtualenv venv
@@ -74,8 +74,8 @@ OUT
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-version-name "echo \${PYENV_VERSION}"
   stub pyenv-exec "virtualenv --verbose --python=python ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : true"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
   run pyenv-virtualenv -v -p python venv
@@ -98,8 +98,8 @@ OUT
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-version-name "echo \${PYENV_VERSION}"
   stub pyenv-exec "virtualenv --verbose --python=python ${PYENV_ROOT}/versions/venv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
-  stub pyenv-exec "python -m ensurepip : false"
-  stub pyenv-exec "python */get-pip.py : true"
+  stub pyenv-exec "python -s -m ensurepip : false"
+  stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
   run pyenv-virtualenv --verbose --python=python venv