diff --git a/EdkModulePkg/Universal/EmuVariable/RuntimeDxe/EmuVariable.c b/EdkModulePkg/Universal/EmuVariable/RuntimeDxe/EmuVariable.c
index d39ecd2ce0..accf5d799c 100644
--- a/EdkModulePkg/Universal/EmuVariable/RuntimeDxe/EmuVariable.c
+++ b/EdkModulePkg/Universal/EmuVariable/RuntimeDxe/EmuVariable.c
@@ -31,6 +31,7 @@ ESAL_VARIABLE_GLOBAL  *mVariableModuleGlobal;
 // when EfiAcquireLock in UefiLib can handle the
 // the call in UEFI Runtimer driver in RT phase.
 //
+STATIC
 VOID
 AcquireLockOnlyAtBootTime (
   IN EFI_LOCK  *Lock
@@ -46,6 +47,7 @@ AcquireLockOnlyAtBootTime (
 // when EfiAcquireLock in UefiLib can handle the
 // the call in UEFI Runtimer driver in RT phase.
 //
+STATIC
 VOID
 ReleaseLockOnlyAtBootTime (
   IN EFI_LOCK  *Lock
diff --git a/EdkModulePkg/Universal/Variable/RuntimeDxe/Variable.c b/EdkModulePkg/Universal/Variable/RuntimeDxe/Variable.c
index 46ffc7ddbb..da711ebe48 100644
--- a/EdkModulePkg/Universal/Variable/RuntimeDxe/Variable.c
+++ b/EdkModulePkg/Universal/Variable/RuntimeDxe/Variable.c
@@ -32,6 +32,7 @@ ESAL_VARIABLE_GLOBAL  *mVariableModuleGlobal;
 // when EfiAcquireLock in UefiLib can handle the
 // the call in UEFI Runtimer driver in RT phase.
 //
+STATIC
 VOID
 AcquireLockOnlyAtBootTime (
   IN EFI_LOCK  *Lock
@@ -47,6 +48,7 @@ AcquireLockOnlyAtBootTime (
 // when EfiAcquireLock in UefiLib can handle the
 // the call in UEFI Runtimer driver in RT phase.
 //
+STATIC
 VOID
 ReleaseLockOnlyAtBootTime (
   IN EFI_LOCK  *Lock