diff --git a/MdePkg/Library/BaseLib/Ia32/GccInline.c b/MdePkg/Library/BaseLib/Ia32/GccInline.c
index e6a9e171f4..80db16c28b 100644
--- a/MdePkg/Library/BaseLib/Ia32/GccInline.c
+++ b/MdePkg/Library/BaseLib/Ia32/GccInline.c
@@ -1082,7 +1082,7 @@ InternalX86ReadIdtr (
   )
 {
   __asm__ __volatile__ (
-    "sldt  %0"
+    "sidt  %0"
     : "=m" (*Idtr)
     );
 }
diff --git a/MdePkg/Library/BaseLib/X64/GccInline.c b/MdePkg/Library/BaseLib/X64/GccInline.c
index 8be2bef121..6a4b5d5c45 100644
--- a/MdePkg/Library/BaseLib/X64/GccInline.c
+++ b/MdePkg/Library/BaseLib/X64/GccInline.c
@@ -1092,7 +1092,7 @@ InternalX86ReadIdtr (
   )
 {
   __asm__ __volatile__ (
-    "sldt  %0"
+    "sidt  %0"
     : "=m" (*Idtr)
     );
 }