diff --git a/src/include/ngspice/Makefile.am b/src/include/ngspice/Makefile.am
index 216816ef8..fd7fec02c 100644
--- a/src/include/ngspice/Makefile.am
+++ b/src/include/ngspice/Makefile.am
@@ -1,11 +1,9 @@
 ## Process this file with automake to produce Makefile.in
 
-includedir = $(pkgdatadir)/include/ngspice
-
-nodist_include_HEADERS = \
+nodist_pkginclude_HEADERS = \
 	config.h
 
-include_HEADERS = \
+pkginclude_HEADERS = \
 	tclspice.h	\
 	acdefs.h	\
 	bdrydefs.h	\