diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 4271212d8f7ca4f0c402d12cdd59b658e60a0150..6dacfa98acd708d3679e36012291a1134da60430 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-10-25  Martin Liska  <mliska@suse.cz>
+
+	PR testsuite/87739
+	* gcc.dg/tree-ssa/pr84436-5.c (foo): Use signed char.
+
 2018-10-25  Martin Liska  <mliska@suse.cz>
 
 	PR other/87735
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr84436-5.c b/gcc/testsuite/gcc.dg/tree-ssa/pr84436-5.c
index 3f9e2245e84d3e405d8a9b4486fe3ab27b4fd8db..e8c1337de3e9040cd1f45ba0c32532bd8b447e41 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr84436-5.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr84436-5.c
@@ -2,9 +2,9 @@
 /* { dg-options "-O2 -fdump-tree-switchconv -fdump-tree-optimized" } */
 /* { dg-do run } */
 
-char
+signed char
 __attribute__ ((noipa))
-foo (char how)
+foo (signed char how)
 {
   switch (how) {
     case -4: how = 96; break;