diff --git a/conf/commonshrc b/conf/commonshrc
index d7f2faa..4f87eed 100644
--- a/conf/commonshrc
+++ b/conf/commonshrc
@@ -32,7 +32,7 @@ add_to PATH ~/.cabal/bin
 add_myprefix_to LD_LIBRARY_PATH lib
 add_myprefix_to LD_LIBRARY_PATH lib64
 
-add_to MANPATH ''
+add_to MANPATH :
 add_myprefix_to MANPATH share/man
 
 add_myprefix_to PKG_CONFIG_PATH lib/pkgconfig