diff --git a/bin/eval-config b/bin/eval-config
new file mode 100755
index 00000000..ef62547b
--- /dev/null
+++ b/bin/eval-config
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+CONFIG_ROOT="${NGINX_CONFIG_ROOT:=config}"
+CONFIG_FILE="${NGINX_CONFIG_FILE:=nginx.conf.erb}"
+
+# Evaluate config to get $PORT
+erb $CONFIG_ROOT/$CONFIG_FILE > config/nginx.conf
\ No newline at end of file
diff --git a/bin/start-nginx b/bin/start-nginx
index dbf19062..1e8655c2 100755
--- a/bin/start-nginx
+++ b/bin/start-nginx
@@ -4,8 +4,7 @@ psmgr=/tmp/nginx-buildpack-wait
 rm -f $psmgr
 mkfifo $psmgr
 
-# Evaluate config to get $PORT
-erb config/nginx.conf.erb > config/nginx.conf
+./eval-config
 
 n=1
 while getopts :f option ${@:1:2}
diff --git a/bin/start-nginx-debug b/bin/start-nginx-debug
index 8a6b0912..9a795f83 100755
--- a/bin/start-nginx-debug
+++ b/bin/start-nginx-debug
@@ -4,8 +4,7 @@ psmgr=/tmp/nginx-buildpack-wait
 rm -f $psmgr
 mkfifo $psmgr
 
-# Evaluate config to get $PORT
-erb config/nginx.conf.erb > config/nginx.conf
+./eval-config
 
 n=1
 while getopts :f option ${@:1:2}
diff --git a/bin/start-nginx-solo b/bin/start-nginx-solo
index f8eccd99..0ff1d820 100755
--- a/bin/start-nginx-solo
+++ b/bin/start-nginx-solo
@@ -4,8 +4,7 @@ psmgr=/tmp/nginx-buildpack-wait
 rm -f $psmgr
 mkfifo $psmgr
 
-# Evaluate config to get $PORT
-erb config/nginx.conf.erb > config/nginx.conf
+./eval-config
 
 n=1
 while getopts :f option ${@:1:2}