diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7ad7c0b..55c24f2 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -264,6 +264,7 @@
 static void pc_init_pci_1_4(QEMUMachineInitArgs *args)
 {
     x86_cpu_compat_set_features("n270", FEAT_1_ECX, 0, CPUID_EXT_MOVBE);
+    x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
     has_pci_info = false;
     pc_init_pci(args);
 }
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 6c7b401..bd25071 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -233,6 +233,7 @@
 static void pc_q35_init_1_4(QEMUMachineInitArgs *args)
 {
     x86_cpu_compat_set_features("n270", FEAT_1_ECX, 0, CPUID_EXT_MOVBE);
+    x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
     has_pci_info = false;
     pc_q35_init(args);
 }