diff --git a/gcc/config/i386/x86-tune-costs.h b/gcc/config/i386/x86-tune-costs.h
index d3aaaa4b5cc..d0168eebdc1 100644
--- a/gcc/config/i386/x86-tune-costs.h
+++ b/gcc/config/i386/x86-tune-costs.h
@@ -1924,8 +1924,8 @@ struct processor_costs znver4_cost = {
 					   in 32bit, 64bit, 128bit, 256bit and 512bit */
   {8, 8, 8, 12, 12},			/* cost of storing SSE register
 					   in 32bit, 64bit, 128bit, 256bit and 512bit */
-  {6, 6, 6, 6, 6},			/* cost of unaligned loads.  */
-  {8, 8, 8, 8, 8},			/* cost of unaligned stores.  */
+  {6, 6, 10, 10, 12},			/* cost of unaligned loads.  */
+  {8, 8, 8, 12, 12},			/* cost of unaligned stores.  */
   2, 2, 2,				/* cost of moving XMM,YMM,ZMM
 					   register.  */
   6,					/* cost of moving SSE register to integer.  */