diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3bdbf563898..39765211a7a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-12-07  Paul A. Clarke  <pc@us.ibm.com>
+
+	PR target/88408
+	* config/rs6000/mmintrin.h (_mm_packs_pu16): Correctly use "__vector".
+
 2018-12-07  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/88349
diff --git a/gcc/config/rs6000/mmintrin.h b/gcc/config/rs6000/mmintrin.h
index a267b13d49f..924ae566683 100644
--- a/gcc/config/rs6000/mmintrin.h
+++ b/gcc/config/rs6000/mmintrin.h
@@ -228,9 +228,9 @@ _mm_packs_pu16 (__m64 __m1, __m64 __m2)
 #endif
   const __vector signed short __zero = { 0 };
   __vector __bool short __select = vec_cmplt (vm1, __zero);
-  r = vec_packs ((vector unsigned short) vm1, (vector unsigned short) vm1);
+  r = vec_packs ((__vector unsigned short) vm1, (__vector unsigned short) vm1);
   __vector __bool char packsel = vec_pack (__select, __select);
-  r = vec_sel (r, (const vector unsigned char) __zero, packsel);
+  r = vec_sel (r, (const __vector unsigned char) __zero, packsel);
   return (__m64) ((__vector long long) r)[0];
 }