diff --git a/mode/perl.py b/mode/perl.py
index a13df82..97de67d 100644
--- a/mode/perl.py
+++ b/mode/perl.py
@@ -301,11 +301,13 @@ class PerlSetLib(Method):
     '''Set the path(s) to find perl modules'''
     args = [arg("lib", dt='path', p="Lib: ", dv=lambda w: '.')]
     def _execute(self, w, **vargs):
-        w.application.config['perl.libs'] = vargs['lib'].split(':')
+        libs = vargs['lib'].split(':')
+        w.application.config['perl.libs'] = libs
 class PerlAddLib(PerlSetLib):
-    '''Set the path(s) to find perl modules'''
+    '''Add a path(s) to find perl modules'''
     def _execute(self, w, **vargs):
-        w.application.config['perl.libs'].append(vargs['lib'])
+        libs = vargs['lib'].split(':')
+        w.application.config['perl.libs'].extend(libs)
 
 class PerlBase(Method):
     bname = '*Perl*'