diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index a19e17229be496440064d684566e68aab28b8e74..1329f970a9709ca58b85bfbed2badd02f84af837 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -265,6 +265,7 @@ static void pc_init_pci_1_4(QEMUMachineInitArgs *args)
 {
     has_pvpanic = false;
     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);
     pc_init_pci_1_5(args);
 }
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index be6013f472f3121466d3bf08eb94dc3d22521dd4..1d84ead9ee34bd339e0bde7ff472a8c3ee666702 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)
 {
     has_pvpanic = false;
     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);
     pc_q35_init_1_5(args);
 }