diff --git a/sysconfigs/target/target-x86_64.conf b/sysconfigs/target/target-x86_64.conf
index 09b255e..0e57d9c 100644
--- a/sysconfigs/target/target-x86_64.conf
+++ b/sysconfigs/target/target-x86_64.conf
@@ -51,7 +51,7 @@
    stepping = "1"
    feature_edx = "sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu"
    feature_ecx = "sse3"
-   extfeature_edx = "lm fxsr mmx nx pat cmov pge syscall apic cx8 mce pae msr tsc pse de fpu"
+   extfeature_edx = "lm fxsr mmx nx pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu"
 #   extfeature_ecx = ""
    xlevel = "0x80000008"
    model_id = "AMD Opteron 240 (Gen 1 Class Opteron)"
@@ -65,7 +65,7 @@
    stepping = "1"
    feature_edx = "sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu"
    feature_ecx = "cx16 sse3"
-   extfeature_edx = "lm rdtscp fxsr mmx nx pat cmov pge syscall apic cx8 mce pae msr tsc pse de fpu"
+   extfeature_edx = "lm rdtscp fxsr mmx nx pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu"
    extfeature_ecx = "svm lahf_lm"
    xlevel = "0x80000008"
    model_id = "AMD Opteron 22xx (Gen 2 Class Opteron)"
@@ -79,7 +79,7 @@
    stepping = "1"
    feature_edx = "sse2 sse fxsr mmx clflush pse36 pat cmov mca pge mtrr sep apic cx8 mce pae msr tsc pse de fpu"
    feature_ecx = "popcnt cx16 monitor sse3"
-   extfeature_edx = "lm rdtscp fxsr mmx nx pat cmov pge syscall apic cx8 mce pae msr tsc pse de fpu"
+   extfeature_edx = "lm rdtscp fxsr mmx nx pse36 pat cmov mca pge mtrr syscall apic cx8 mce pae msr tsc pse de fpu"
    extfeature_ecx = "misalignsse sse4a abm svm lahf_lm"
    xlevel = "0x80000008"
    model_id = "AMD Opteron 23xx (Gen 3 Class Opteron)"