diff --git a/ccache.csh.in b/ccache.csh.in
index 4edbb51..0f58940 100644
--- a/ccache.csh.in
+++ b/ccache.csh.in
@@ -24,3 +24,5 @@ else if ( $uid != 0 ) then
         unsetenv CCACHE_HARDLINK
     endif
 endif
+
+setenv CCACHE_HASHDIR
diff --git a/ccache.sh.in b/ccache.sh.in
index 0ce4d64..29f8303 100644
--- a/ccache.sh.in
+++ b/ccache.sh.in
@@ -25,3 +25,5 @@ elif [ "${EUID:-}" != 0 ] ; then
         unset CCACHE_HARDLINK
     fi
 fi
+
+export CCACHE_HASHDIR=
diff --git a/ccache.spec b/ccache.spec
index 4f26036..2d0387c 100644
--- a/ccache.spec
+++ b/ccache.spec
@@ -103,6 +103,7 @@ done
 
 %changelog
 * Sun Jan  8 2012 Ville Skyttä <ville.skytta@iki.fi> - 2.4-20
+- Turn on CCACHE_HASHDIR by default (#759592, Jan Kratochvil).
 - Replace Requires(trigger*) with plain requires to appease rpmbuild >= 4.9.
 
 * Sat Apr  2 2011 Ville Skyttä <ville.skytta@iki.fi> - 2.4-19