diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareGuid.S b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareGuid.S
index 6d0089049d..b74056fa1f 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareGuid.S
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareGuid.S
@@ -30,6 +30,7 @@
     .thumb
     .syntax unified
     .align  5
+    .type   ASM_PFX(InternalMemCompareGuid), %function
 ASM_GLOBAL ASM_PFX(InternalMemCompareGuid)
 ASM_PFX(InternalMemCompareGuid):
     push    {r4, lr}
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareMem.S b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareMem.S
index 9483aab61a..25a9a09945 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareMem.S
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CompareMem.S
@@ -46,6 +46,7 @@
     .thumb
     .syntax unified
     .align  5
+    .type   ASM_PFX(InternalMemCompareMem), %function
 ASM_GLOBAL ASM_PFX(InternalMemCompareMem)
 ASM_PFX(InternalMemCompareMem):
     push    {r4-r8, lr}
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CopyMem.S b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CopyMem.S
index 195a0b23f7..e1543f3c2a 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CopyMem.S
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/CopyMem.S
@@ -42,6 +42,7 @@ InternalMemCopyMem (
   IN      UINTN                     Length
   )
 **/
+    .type   ASM_PFX(InternalMemCopyMem), %function
 ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
 ASM_PFX(InternalMemCopyMem):
     push    {r4-r11, lr}
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S
index 2d8f4d5b86..928c1a12d5 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/Arm/SetMem.S
@@ -16,6 +16,7 @@
     .thumb
     .syntax unified
     .align  5
+    .type   ASM_PFX(InternalMemSetMem16), %function
 ASM_GLOBAL ASM_PFX(InternalMemSetMem16)
 ASM_PFX(InternalMemSetMem16):
     uxth    r2, r2
@@ -23,17 +24,20 @@ ASM_PFX(InternalMemSetMem16):
     orr     r2, r2, r2, lsl #16
     b       0f
 
+    .type   ASM_PFX(InternalMemSetMem32), %function
 ASM_GLOBAL ASM_PFX(InternalMemSetMem32)
 ASM_PFX(InternalMemSetMem32):
     lsl     r1, r1, #2
     b       0f
 
+    .type   ASM_PFX(InternalMemSetMem64), %function
 ASM_GLOBAL ASM_PFX(InternalMemSetMem64)
 ASM_PFX(InternalMemSetMem64):
     lsl     r1, r1, #3
     b       1f
 
     .align  5
+    .type   ASM_PFX(InternalMemSetMem), %function
 ASM_GLOBAL ASM_PFX(InternalMemSetMem)
 ASM_PFX(InternalMemSetMem):
     uxtb    r2, r2
@@ -41,6 +45,7 @@ ASM_PFX(InternalMemSetMem):
     orr     r2, r2, r2, lsl #16
     b       0f
 
+    .type   ASM_PFX(InternalMemZeroMem), %function
 ASM_GLOBAL ASM_PFX(InternalMemZeroMem)
 ASM_PFX(InternalMemZeroMem):
     movs    r2, #0