diff --git a/plugins/python-build/bin/python-build b/plugins/python-build/bin/python-build
index d7284c69..58531d9d 100755
--- a/plugins/python-build/bin/python-build
+++ b/plugins/python-build/bin/python-build
@@ -588,7 +588,7 @@ fetch_jar() {
 
   # Must use full path to jar and destination directory:
   #   http://bugs.jython.org/issue2350
-  { if $JAVA -jar $PWD/${package_name}.jar -s -d $PWD/${package_name}; then
+  { if $JAVA -jar "$PWD/${package_name}.jar" -s -d "$PWD/${package_name}"; then
       if [ -z "$KEEP_BUILD_PATH" ]; then
         rm -f "$package_filename"
       else
@@ -902,11 +902,10 @@ fix_jython_shebangs() {
   for file in "${PREFIX_PATH}/bin"/*; do
     case "$(head -1 "${file}")" in
     "#!"*"/bin/jython" )
-      sed -i.bak "1 s:.*:#\!\/usr\/bin\/env ${PREFIX_PATH}\/bin\/jython:" "${file}"
+      sed -i.bak "1 s:.*:#\!${PREFIX_PATH}\/bin\/jython:" "${file}"
       ;;
     "#!"*"/bin/python2.7"* )
-      # Jython 2.7+ requires CPython 2.7 to run
-      sed -i.bak "1 s:.*:#\!\/usr\/bin\/env python2.7:" "${file}"
+      sed -i.bak "1 s:.*:#\!\/usr\/bin\/env python:" "${file}"
       ;;
     esac
     rm -f "${file}.bak"
@@ -1276,6 +1275,17 @@ require_java() {
   export JAVA="$java"
 }
 
+# Let Jython installer to generate shell script instead of python script even if there's `python2.7` available in `$PATH` (#800)
+# FIXME: better function naming
+unrequire_python27() {
+  export PATH="${BUILD_PATH}/bin:${PATH}"
+  mkdir -p "${BUILD_PATH}/bin"
+  if command -v python2.7 1>/dev/null 2>&1; then
+    echo false > "${BUILD_PATH}/bin/python2.7"
+    chmod +x "${BUILD_PATH}/bin/python2.7"
+  fi
+}
+
 require_distro() {
   for arg; do
     if [[ "$(cat /etc/issue 2>/dev/null || true)" == "$arg"* ]]; then
diff --git a/plugins/python-build/share/python-build/jython-2.7.0 b/plugins/python-build/share/python-build/jython-2.7.0
index b4f49716..35cf2e1b 100644
--- a/plugins/python-build/share/python-build/jython-2.7.0
+++ b/plugins/python-build/share/python-build/jython-2.7.0
@@ -1,4 +1,5 @@
 require_java
+unrequire_python27
 install_jar "jython-2.7.0" "https://repo1.maven.org/maven2/org/python/jython-installer/2.7.0/jython-installer-2.7.0.jar#b44352ece72382268a60e2848741c96609a91d796bb9a9c6ebeff62f0c12c9cf" jython
 
 case "$(pypy_architecture 2>/dev/null || true)" in
diff --git a/plugins/python-build/share/python-build/jython-2.7.1b1 b/plugins/python-build/share/python-build/jython-2.7.1b1
index 2caf78aa..44c6d197 100644
--- a/plugins/python-build/share/python-build/jython-2.7.1b1
+++ b/plugins/python-build/share/python-build/jython-2.7.1b1
@@ -1,4 +1,5 @@
 require_java
+unrequire_python27
 install_jar "jython-2.7.1b1" "https://repo1.maven.org/maven2/org/python/jython-installer/2.7.1b1/jython-installer-2.7.1b1.jar#c7a05911fed666c8f9df5bdce50bb5dc75482b7f6b1f1dbe433162d94c960ec3" jython
 
 case "$(pypy_architecture 2>/dev/null || true)" in
diff --git a/plugins/python-build/share/python-build/jython-2.7.1b2 b/plugins/python-build/share/python-build/jython-2.7.1b2
index a47e850f..51b39656 100644
--- a/plugins/python-build/share/python-build/jython-2.7.1b2
+++ b/plugins/python-build/share/python-build/jython-2.7.1b2
@@ -1,4 +1,5 @@
 require_java
+unrequire_python27
 install_jar "jython-2.7.1b2" "https://repo1.maven.org/maven2/org/python/jython-installer/2.7.1b2/jython-installer-2.7.1b2.jar#d994500808c8d448baab1f98e043e6a11360cff302f401901e73f0e34c27251a" jython
 
 case "$(pypy_architecture 2>/dev/null || true)" in
diff --git a/plugins/python-build/share/python-build/jython-2.7.1b3 b/plugins/python-build/share/python-build/jython-2.7.1b3
index c13abbcd..058d927f 100644
--- a/plugins/python-build/share/python-build/jython-2.7.1b3
+++ b/plugins/python-build/share/python-build/jython-2.7.1b3
@@ -1,4 +1,5 @@
 require_java
+unrequire_python27
 install_jar "jython-2.7.1b3" "https://repo1.maven.org/maven2/org/python/jython-installer/2.7.1b3/jython-installer-2.7.1b3.jar#5c6c7dc372a131dbc2b29b95407c69a4ebab22c1823d9098b7f993444f3090c5" jython
 
 case "$(pypy_architecture 2>/dev/null || true)" in
diff --git a/plugins/python-build/share/python-build/jython-dev b/plugins/python-build/share/python-build/jython-dev
index 576c3a51..7b58692e 100644
--- a/plugins/python-build/share/python-build/jython-dev
+++ b/plugins/python-build/share/python-build/jython-dev
@@ -1,4 +1,5 @@
 require_java
+unrequire_python27
 install_hg "jython-dev" "https://hg.python.org/jython" "default" jython_builder ez_setup
 # pip (>= 1.3) does not work properly since it uses HTTPS for downloads
 # * https://github.com/yyuu/pyenv/issues/15