diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
index 89ec339dd0..936a855f12 100644
--- a/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
+++ b/MdeModulePkg/Bus/Pci/EhciDxe/EhciSched.c
@@ -981,7 +981,7 @@ EhcMoniteAsyncRequests (
     }
 
     if (ProcBuf != NULL) {
-      gBS->FreePool (ProcBuf);
+      FreePool (ProcBuf);
     }
   }
 
diff --git a/MdeModulePkg/Bus/Pci/UhciDxe/Uhci.c b/MdeModulePkg/Bus/Pci/UhciDxe/Uhci.c
index deb21dd837..26f13dbfd0 100644
--- a/MdeModulePkg/Bus/Pci/UhciDxe/Uhci.c
+++ b/MdeModulePkg/Bus/Pci/UhciDxe/Uhci.c
@@ -1490,7 +1490,7 @@ UhciAllocateDev (
   return Uhc;
 
 ON_ERROR:
-  gBS->FreePool (Uhc);
+  FreePool (Uhc);
   return NULL;
 }
 
@@ -1520,7 +1520,7 @@ UhciFreeDev (
     FreeUnicodeStringTable (Uhc->CtrlNameTable);
   }
 
-  gBS->FreePool (Uhc);
+  FreePool (Uhc);
 }