diff --git a/README.md b/README.md
index 03c30caf9..73622087a 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,7 @@ Build
 
 If librdkafka is installed in a non-standard location provide the include and library directories with:
 
-    $ CPLUS_INCLUDE_PATH=/path/to/include LIBRARY_PATH=/path/to/lib python setup.py ...
+    $ C_INCLUDE_PATH=/path/to/include LIBRARY_PATH=/path/to/lib python setup.py ...
 
 
 Tests