diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
index bdff5bd598..7720c2708d 100644
--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c
@@ -1330,10 +1330,10 @@ Tcg2SubmitCommand (
     return EFI_DEVICE_ERROR;
   }
 
-  if (InputParameterBlockSize >= mTcgDxeData.BsCap.MaxCommandSize) {
+  if (InputParameterBlockSize > mTcgDxeData.BsCap.MaxCommandSize) {
     return EFI_INVALID_PARAMETER;
   }
-  if (OutputParameterBlockSize >= mTcgDxeData.BsCap.MaxResponseSize) {
+  if (OutputParameterBlockSize > mTcgDxeData.BsCap.MaxResponseSize) {
     return EFI_INVALID_PARAMETER;
   }
 
diff --git a/SecurityPkg/Tcg/TrEEDxe/TrEEDxe.c b/SecurityPkg/Tcg/TrEEDxe/TrEEDxe.c
index dfdee04688..a30cd5161d 100644
--- a/SecurityPkg/Tcg/TrEEDxe/TrEEDxe.c
+++ b/SecurityPkg/Tcg/TrEEDxe/TrEEDxe.c
@@ -893,10 +893,10 @@ TreeSubmitCommand (
     return EFI_UNSUPPORTED;
   }
 
-  if (InputParameterBlockSize >= mTcgDxeData.BsCap.MaxCommandSize) {
+  if (InputParameterBlockSize > mTcgDxeData.BsCap.MaxCommandSize) {
     return EFI_INVALID_PARAMETER;
   }
-  if (OutputParameterBlockSize >= mTcgDxeData.BsCap.MaxResponseSize) {
+  if (OutputParameterBlockSize > mTcgDxeData.BsCap.MaxResponseSize) {
     return EFI_INVALID_PARAMETER;
   }