diff --git a/arpack-ng-config.cmake.in b/arpack-ng-config.cmake.in
index 6fe17b8..0109001 100644
--- a/arpack-ng-config.cmake.in
+++ b/arpack-ng-config.cmake.in
@@ -1,7 +1,7 @@
 # Config file for the arpack-ng package. It defines the following variables:
 # - arpack_ng_INCLUDE_DIRS - include directories
 # - arpack_ng_LIBRARIES    - libraries to link against
-set(arpack_ng_INCLUDE_DIRS "@CMAKE_INSTALL_PREFIX@/include" CACHE PATH "arpack-ng: include directories" FORCE)
+set(arpack_ng_INCLUDE_DIRS "@CMAKE_INSTALL_PREFIX@/include/arpack" CACHE PATH "arpack-ng: include directories" FORCE)
 if(EXISTS "@CMAKE_INSTALL_PREFIX@/lib/libarpack.a")
   set(arpack_ng_LIBRARIES "@CMAKE_INSTALL_PREFIX@/lib/libarpack.a" CACHE FILEPATH "arpack-ng: libraries" FORCE)
 elseif(EXISTS "@CMAKE_INSTALL_PREFIX@/lib/libarpack.so")
diff --git a/arpack.pc.in b/arpack.pc.in
index 2baed08..5f7d4bc 100644
--- a/arpack.pc.in
+++ b/arpack.pc.in
@@ -1,7 +1,7 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 libdir=@libdir@
-includedir=@includedir@
+includedir=@includedir@/arpack
 
 Name: @PACKAGE_NAME@
 Description: Collection of Fortran77 subroutines designed to solve large scale eigenvalue problems