diff --git a/ChangeLog.txt b/ChangeLog.txt
index 7095de0356..74de95b2be 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -7,6 +7,12 @@
    Entries may not always be in chronological/commit order.
    See license at the end of file. */
 
+2025-07-10 14:04 UTC+0200 Aleksander Czajczynski (hb fki.pl)
+  * contrib/hbpost.hbm
+    ! fix missing contrib/*/tests/files when using "make install"
+      and HB_INSTALL_PREFIX.
+      Thanks Jose Quintas for reporting (issue #310)
+
 2025-07-09 15:04 UTC+0200 Przemyslaw Czerpak (druzus/at/poczta.onet.pl)
   * include/hbclass.ch
     ! fixed class declaration to allow muliple PP run - thanks to Wen Sheng
diff --git a/contrib/hbpost.hbm b/contrib/hbpost.hbm
index 0e5d0641be..84cc03ea78 100644
--- a/contrib/hbpost.hbm
+++ b/contrib/hbpost.hbm
@@ -71,6 +71,7 @@
 -instfile=contrib:${_HB_CONTRIB_SUBDIR}*.ch
 -instfile=contrib:${_HB_CONTRIB_SUBDIR}*.txt
 -instfile=contrib_tests:${_HB_CONTRIB_SUBDIR}tests/*.*
+-instfile=contrib_tests_files:${_HB_CONTRIB_SUBDIR}tests/files/*.*
 
 # install (GNU Make)
 {_HB_BUILD_INSTALL&_HB_INSTALL_LIB&hblib}-instpath=${_HB_INSTALL_LIB}/
@@ -84,6 +85,7 @@
 {_HB_BUILD_INSTALL&_HB_INSTALL_LIB&!(HB_INSTALL_IMPLIB='no')}-instpath=depimplib:${_HB_INSTALL_LIB}/
 {_HB_BUILD_INSTALL&_HB_INSTALL_CONTRIB&hblib}-instpath=contrib:${_HB_INSTALL_CONTRIB}/${_HB_CONTRIB_SUBDIR}
 {_HB_BUILD_INSTALL&_HB_INSTALL_CONTRIB&hblib}-instpath=contrib_tests:${_HB_INSTALL_CONTRIB}/${_HB_CONTRIB_SUBDIR}/tests/
+{_HB_BUILD_INSTALL&_HB_INSTALL_CONTRIB&hblib}-instpath=contrib_tests_files:${_HB_INSTALL_CONTRIB}/${_HB_CONTRIB_SUBDIR}/tests/files/
 {_HB_BUILD_INSTALL}-instforce
 
 # install (standalone)