diff --git a/bin/pyenv-virtualenv b/bin/pyenv-virtualenv
index df65e04..414f526 100755
--- a/bin/pyenv-virtualenv
+++ b/bin/pyenv-virtualenv
@@ -137,13 +137,14 @@ usage() {
 detect_venv() {
   # Check the existence of executables as a workaround for the issue with pyenv-which-ext
   # https://github.com/yyuu/pyenv-virtualenv/issues/26
-  if [ -x "$(pyenv-prefix)/bin/conda" ]; then
+  local prefix="$(pyenv-prefix)"
+  if [ -x "${prefix}/bin/conda" ]; then
     HAS_CONDA=1
   else
-    if [ -x "$(pyenv-prefix)/bin/virtualenv" ]; then
+    if [ -x "${prefix}/bin/virtualenv" ]; then
       HAS_VIRTUALENV=1
     fi
-    if [ -x "$(pyenv-prefix)/bin/pyvenv" ]; then
+    if [ -x "${prefix}/bin/pyvenv" ]; then
       HAS_PYVENV=1
     fi
   fi
diff --git a/test/pip.bats b/test/pip.bats
index fa4fde4..1d8abff 100644
--- a/test/pip.bats
+++ b/test/pip.bats
@@ -24,8 +24,6 @@ unstub_pyenv() {
   export PYENV_VERSION="3.4.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pyvenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";mkdir -p \${PYENV_ROOT}/versions/3.4.1/envs/venv/bin"
   stub pyenv-exec "python -s -m ensurepip : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";touch \${PYENV_ROOT}/versions/3.4.1/envs/venv/bin/pip"
 
@@ -50,8 +48,6 @@ OUT
   export PYENV_VERSION="3.3.5"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pyvenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";mkdir -p \${PYENV_ROOT}/versions/3.3.5/envs/venv/bin"
   stub pyenv-exec "python -s -m ensurepip : false"
   stub pyenv-exec "python -s */get-pip.py : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\";touch \${PYENV_ROOT}/versions/3.3.5/envs/venv/bin/pip"
diff --git a/test/pyvenv.bats b/test/pyvenv.bats
index 9748651..f93b83f 100644
--- a/test/pyvenv.bats
+++ b/test/pyvenv.bats
@@ -24,13 +24,13 @@ unstub_pyenv() {
   export PYENV_VERSION="3.4.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pyvenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : true"
 
+  create_executable "3.4.1" "python"
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
+  remove_executable "3.4.1" "conda"
 
   run pyenv-virtualenv venv
 
@@ -48,13 +48,13 @@ OUT
   export PYENV_VERSION="3.4.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "virtualenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : true"
 
+  create_executable "3.4.1" "python"
   create_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
+  remove_executable "3.4.1" "conda"
 
   run pyenv-virtualenv venv
 
@@ -72,16 +72,16 @@ OUT
   export PYENV_VERSION="3.2.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : false"
   stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
+  create_executable "3.2.1" "python"
   remove_executable "3.2.1" "virtualenv"
   remove_executable "3.2.1" "pyvenv"
+  remove_executable "3.2.1" "conda"
 
   run pyenv-virtualenv venv
 
@@ -102,14 +102,14 @@ OUT
   export PYENV_VERSION="3.4.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : true"
 
+  create_executable "3.4.1" "python"
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
+  remove_executable "3.4.1" "conda"
 
   run pyenv-virtualenv -p ${TMP}/python3 venv
 
@@ -128,14 +128,14 @@ OUT
   export PYENV_VERSION="3.4.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-exec "pip install virtualenv : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "virtualenv * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : true"
 
+  create_executable "3.4.1" "python"
   remove_executable "3.4.1" "virtualenv"
   create_executable "3.4.1" "pyvenv"
+  remove_executable "3.4.1" "conda"
 
   run pyenv-virtualenv --python=${TMP}/python3 venv
 
@@ -154,16 +154,16 @@ OUT
   export PYENV_VERSION="3.2.1"
   stub_pyenv "${PYENV_VERSION}"
   stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix " : echo '${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 * : echo PIP_REQUIRE_VENV=\${PIP_REQUIRE_VENV} PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : false"
   stub pyenv-exec "python -s */get-pip.py : true"
   stub curl true
 
+  create_executable "3.2.1" "python"
   remove_executable "3.2.1" "virtualenv"
   remove_executable "3.2.1" "pyvenv"
+  remove_executable "3.2.1" "conda"
 
   PIP_REQUIRE_VENV="true" run pyenv-virtualenv venv
 
diff --git a/test/version.bats b/test/version.bats
index a8a617d..f0e07c8 100644
--- a/test/version.bats
+++ b/test/version.bats
@@ -8,7 +8,6 @@ setup() {
 }
 
 @test "display virtualenv version" {
-  stub pyenv-prefix "echo '${PYENV_ROOT}/versions/2.7.7'"
   stub pyenv-prefix "echo '${PYENV_ROOT}/versions/2.7.7'"
   stub pyenv-exec "virtualenv --version : echo \"1.11\""
 
@@ -25,7 +24,6 @@ setup() {
 }
 
 @test "display pyvenv version" {
-  stub pyenv-prefix "echo '${PYENV_ROOT}/versions/3.4.1'"
   stub pyenv-prefix "echo '${PYENV_ROOT}/versions/3.4.1'"
   stub pyenv-which "pyvenv : echo \"${PYENV_ROOT}/versions/3.4.1/bin/pyvenv\""
 
diff --git a/test/virtualenv.bats b/test/virtualenv.bats
index 641ea05..a62c7f4 100644
--- a/test/virtualenv.bats
+++ b/test/virtualenv.bats
@@ -7,11 +7,11 @@ setup() {
 }
 
 stub_pyenv() {
+  create_executable "${PYENV_VERSION}" "python"
   create_executable "${PYENV_VERSION}" "virtualenv"
   remove_executable "${PYENV_VERSION}" "pyvenv"
+  remove_executable "${PYENV_VERSION}" "conda"
 
-  stub pyenv-prefix "echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
-  stub pyenv-prefix "echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-prefix "echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-prefix "echo '${PYENV_ROOT}/versions/${PYENV_VERSION}'"
   stub pyenv-hooks "virtualenv : echo"