diff --git a/include/Makefile.am b/include/Makefile.am
index fd28024..15301d6 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -5,5 +5,5 @@ AUTOMAKE_OPTIONS=foreign
 DISTCLEANFILES=ffitarget.h
 EXTRA_DIST=ffi.h.in ffi_common.h
 
-includesdir = $(libdir)/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
+includesdir = $(includedir)
 nodist_includes_HEADERS = ffi.h ffitarget.h
diff --git a/include/Makefile.in b/include/Makefile.in
index 9d747e8..f8f4af0 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -314,7 +314,7 @@ top_srcdir = @top_srcdir@
 AUTOMAKE_OPTIONS = foreign
 DISTCLEANFILES = ffitarget.h
 EXTRA_DIST = ffi.h.in ffi_common.h
-includesdir = $(libdir)/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
+includesdir = $(includedir)
 nodist_includes_HEADERS = ffi.h ffitarget.h
 all: all-am
 
diff --git a/libffi.pc.in b/libffi.pc.in
index edf6fde..0b58ac2 100644
--- a/libffi.pc.in
+++ b/libffi.pc.in
@@ -2,7 +2,7 @@ prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
 toolexeclibdir=@toolexeclibdir@
-includedir=${libdir}/@PACKAGE_NAME@-@PACKAGE_VERSION@/include
+includedir=@exec_prefix@/include
 
 Name: @PACKAGE_NAME@
 Description: Library supporting Foreign Function Interfaces