diff --git a/Cantera/fortran/f77demos/f77demos.mak.in b/Cantera/fortran/f77demos/f77demos.mak.in
index 657f1e26f..58a103777 100644
--- a/Cantera/fortran/f77demos/f77demos.mak.in
+++ b/Cantera/fortran/f77demos/f77demos.mak.in
@@ -34,10 +34,10 @@ CXX_FLAGS = @CXXFLAGS@
 EXT_LIBS = @LOCAL_LIBS@ -lctcxx
 
 # the directory where the Cantera libraries are located
-CANTERA_LIBDIR=@CANTERA_LIBDIR@
+CANTERA_LIBDIR=@ct_libdir@
 
 # the directory where Cantera include files may be found.
-CANTERA_INCDIR=@CANTERA_INCDIR@
+CANTERA_INCDIR=@ct_incroot@
 
 # flags passed to the C++ compiler/linker for the linking step
 LCXX_FLAGS = -L$(CANTERA_LIBDIR) @CXXFLAGS@