diff --git a/nginx/source.sls b/nginx/source.sls
index b4da976..ea0eade 100644
--- a/nginx/source.sls
+++ b/nginx/source.sls
@@ -6,6 +6,7 @@
 {% set nginx = pillar.get('nginx', {}) -%}
 {% set use_sysvinit = nginx.get('use_sysvinit', nginx_map['use_sysvinit']) %}
 {% set version = nginx.get('version', '1.6.2') -%}
+{% set tarball_url = nginx.get('tarball_url', 'http://nginx.org/download/nginx-' + version + '.tar.gz') -%}
 {% set checksum = nginx.get('checksum', 'sha256=b5608c2959d3e7ad09b20fc8f9e5bd4bc87b3bc8ba5936a513c04ed8f1391a18') -%}
 {% set home = nginx.get('home', nginx_map['home']) -%}
 {% set base_temp_dir = nginx.get('base_temp_dir', '/tmp') -%}
@@ -71,7 +72,7 @@ get-nginx:
       - libssl-dev
   file.managed:
     - name: {{ nginx_package }}
-    - source: http://nginx.org/download/nginx-{{ version }}.tar.gz
+    - source: {{ tarball_url }}
     - source_hash: {{ checksum }}
     - require:
       - file: {{ nginx_modules_dir }}
@@ -113,6 +114,42 @@ get-ngx_devel_kit:
       - file: get-ngx_devel_kit
 {% endif %}
 
+nginx-source-modified:
+  cmd.run:
+    - cwd: {{ nginx_source }}
+    - stateful: True
+    - names:
+      - m=$(find . \! -name "build.*" -newer {{ sbin_dir }}/nginx -print -quit);
+        r=$?;
+        if [ x$r != x0 ]; then
+          echo "changed=yes comment='binary file does not exist or other find error'";
+          exit 0;
+        fi;
+        if [ x$m != "x" ]; then
+          echo "changed=yes comment='source files are newer than binary'";
+          exit 0;
+        fi;
+        echo "changed=no comment='source files are older than binary'"
+
+{% for name, module in nginx.get('modules', {}).items() -%}
+nginx-module-modified-{{name}}:
+  cmd.run:
+    - cwd: {{ nginx_modules_dir }}/{{name}}
+    - stateful: True
+    - names:
+      - m=$(find . \! -name "build.*" -newer {{ sbin_dir }}/nginx -print -quit);
+        r=$?;
+        if [ x$r != x0 ]; then
+          echo "changed=yes comment='binary file does not exist or other find error'";
+          exit 0;
+        fi;
+        if [ x$m != "x" ]; then
+          echo "changed=yes comment='module source files are newer than binary'";
+          exit 0;
+        fi;
+        echo "changed=no comment='module source files are older than binary'"
+{% endfor -%}
+
 nginx:
   cmd.wait:
     - cwd: {{ nginx_source }}
@@ -156,7 +193,9 @@ nginx:
         {% endif %}
     - watch:
       - cmd: get-nginx
+      - cmd: nginx-source-modified
       {% for name, module in nginx.get('modules', {}).items() -%}
+      - cmd: nginx-module-modified-{{name}}
       - file: get-nginx-{{name}}
       {% endfor %}
 {% if use_sysvinit %}