diff --git a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibRTSM/RTSM.c b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibRTSM/RTSM.c
index d8d1c9ac26..11dd7ff1bf 100644
--- a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibRTSM/RTSM.c
+++ b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibRTSM/RTSM.c
@@ -21,6 +21,19 @@
 
 #include <ArmPlatform.h>
 
+/**
+  Return the core per cluster. The method may differ per core type
+
+  This function might be called from assembler before any stack is set.
+
+  @return   Return the core count per cluster
+
+**/
+UINTN
+ArmGetCpuCountPerCluster (
+  VOID
+  );
+
 ARM_CORE_INFO mVersatileExpressMpCoreInfoTable[] = {
   {
     // Cluster 0, Core 0
diff --git a/ArmPlatformPkg/Include/Library/ArmPlatformLib.h b/ArmPlatformPkg/Include/Library/ArmPlatformLib.h
index fe3bc4bb8e..77561a3d05 100644
--- a/ArmPlatformPkg/Include/Library/ArmPlatformLib.h
+++ b/ArmPlatformPkg/Include/Library/ArmPlatformLib.h
@@ -40,19 +40,6 @@ typedef struct {
   UINT64                       NumberOfBytes;
 } ARM_SYSTEM_MEMORY_REGION_DESCRIPTOR;
 
-/**
-  Return the core per cluster. The method may differ per core type
-
-  This function might be called from assembler before any stack is set.
-
-  @return   Return the core count per cluster
-
-**/
-UINTN
-ArmGetCpuCountPerCluster (
-  VOID
-  );
-
 /**
   Return the core position from the value of its MpId register