diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 7f46bc8d28ec..8f6f72e35406 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-09-27  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* g++.dg/ext/altivec-6.C: Change the vec_splat second argument to a
+	valid value, in the "vector bool int" case.
+
 2018-09-27  Uros Bizjak  <ubizjak@gmail.com>
 
 	* gcc.dg/rtl/x86_64/dfinit.c: Update scan-rtl-dump string.
diff --git a/gcc/testsuite/g++.dg/ext/altivec-6.C b/gcc/testsuite/g++.dg/ext/altivec-6.C
index 4c863ef0e762..d17fd90739ac 100644
--- a/gcc/testsuite/g++.dg/ext/altivec-6.C
+++ b/gcc/testsuite/g++.dg/ext/altivec-6.C
@@ -26,5 +26,5 @@ void foo(void) {
    elements in the referenced vector.  */
   vbs = vec_splat(vbs, 4);
   vp = vec_splat(vp, 1);
-  vbi = vec_splat(vbi, 15);  
+  vbi = vec_splat(vbi, 3);  
 }