diff --git a/src/build/ac.jam b/src/build/ac.jam
index c8a890291..10bcd8f95 100644
--- a/src/build/ac.jam
+++ b/src/build/ac.jam
@@ -182,10 +182,10 @@ class ac-library : basic-target
             }
             libnames ?= $(self.default-names) ;
 
-            local includes = $(self.include-path) ;
-            if ! $(includes) && $(use-environment)
+            local include-path = $(self.include-path) ;
+            if ! $(include-path) && $(use-environment)
             {
-                includes = [ modules.peek : $(name:U)_INCLUDE ] ;
+                include-path = [ modules.peek : $(name:U)_INCLUDE ] ;
             }
 
             local library-path = $(self.library-path) ;