diff --git a/tools/perf/tests/make b/tools/perf/tests/make
index 729112f4cfaaaa66b91bcacc57c8a1d9af49203d..ba31c4bd441d72195fbc48fa72673ba7dad0c337 100644
--- a/tools/perf/tests/make
+++ b/tools/perf/tests/make
@@ -58,7 +58,8 @@ make_install_man    := install-man
 make_install_html   := install-html
 make_install_info   := install-info
 make_install_pdf    := install-pdf
-make_install_prefix := install prefix=/tmp/krava
+make_install_prefix       := install prefix=/tmp/krava
+make_install_prefix_slash := install prefix=/tmp/krava/
 make_static         := LDFLAGS=-static
 
 # all the NO_* variable combined
@@ -101,6 +102,7 @@ run += make_util_pmu_bison_o
 run += make_install
 run += make_install_bin
 run += make_install_prefix
+run += make_install_prefix_slash
 # FIXME 'install-*' commented out till they're fixed
 # run += make_install_doc
 # run += make_install_man
@@ -175,11 +177,14 @@ test_make_install_O     := $(call test_dest_files,$(installed_files_all))
 test_make_install_bin   := $(call test_dest_files,$(installed_files_bin))
 test_make_install_bin_O := $(call test_dest_files,$(installed_files_bin))
 
-# We prefix all installed files for make_install_prefix
+# We prefix all installed files for make_install_prefix(_slash)
 # with '/tmp/krava' to match installed/prefix-ed files.
 installed_files_all_prefix := $(addprefix /tmp/krava/,$(installed_files_all))
-test_make_install_prefix   := $(call test_dest_files,$(installed_files_all_prefix))
-test_make_install_prefix_O := $(call test_dest_files,$(installed_files_all_prefix))
+test_make_install_prefix   :=  $(call test_dest_files,$(installed_files_all_prefix))
+test_make_install_prefix_O :=  $(call test_dest_files,$(installed_files_all_prefix))
+
+test_make_install_prefix_slash   := $(test_make_install_prefix)
+test_make_install_prefix_slash_O := $(test_make_install_prefix_O)
 
 # FIXME nothing gets installed
 test_make_install_man    := test -f $$TMP_DEST/share/man/man1/perf.1