diff --git a/docs/ref/contrib/gis/install.txt b/docs/ref/contrib/gis/install.txt
index 82df82793c..3c2dcdc333 100644
--- a/docs/ref/contrib/gis/install.txt
+++ b/docs/ref/contrib/gis/install.txt
@@ -904,10 +904,10 @@ Summary::
 
         export PATH=/opt/local/bin:/opt/local/lib/postgresql83/bin
 
-    In addition, add the ``FALLBACK_DYLD_LIBRARY_PATH`` setting so that
+    In addition, add the ``DYLD_FALLBACK_LIBRARY_PATH`` setting so that
     the libraries can be found by Python::
 
-        export FALLBACK_DYLD_LIBRARY_PATH=/opt/local/lib:/opt/local/lib/postgresql83
+        export DYLD_FALLBACK_LIBRARY_PATH=/opt/local/lib:/opt/local/lib/postgresql83
 
 __ http://www.macports.org/