diff --git a/plugins/input/kismet/build.py b/plugins/input/kismet/build.py
index 5dfd68e01..50972d343 100644
--- a/plugins/input/kismet/build.py
+++ b/plugins/input/kismet/build.py
@@ -38,6 +38,9 @@ libraries.append('mapnik')
 libraries.append(env['ICU_LIB_NAME'])
 libraries.append('boost_thread%s' % env['BOOST_APPEND'])
 
+if env['HAS_BOOST_SYSTEM']:
+    libraries.append('boost_system%s' % env['BOOST_APPEND'])
+
 input_plugin = plugin_env.SharedLibrary('../kismet', source=kismet_src, SHLIBPREFIX='', SHLIBSUFFIX='.input', LIBS=libraries, LINKFLAGS=env['CUSTOM_LDFLAGS'])
 
 # if the plugin links to libmapnik ensure it is built first
diff --git a/plugins/input/postgis/build.py b/plugins/input/postgis/build.py
index 5b2996bbc..b1496a6b1 100644
--- a/plugins/input/postgis/build.py
+++ b/plugins/input/postgis/build.py
@@ -41,6 +41,9 @@ plugin_env['LIBS'].append(env['ICU_LIB_NAME'])
 if env['THREADING'] == 'multi':
 	plugin_env['LIBS'].append('boost_thread%s' % env['BOOST_APPEND'])
 
+if env['HAS_BOOST_SYSTEM']:
+    plugin_env['LIBS'].append('boost_system%s' % env['BOOST_APPEND'])
+
 if env['RUNTIME_LINK'] == 'static':
     #cmd = 'pg_config --libs'
     #plugin_env.ParseConfig(cmd)