diff --git a/MdePkg/Library/BaseLib/GetPowerOfTwo32.c b/MdePkg/Library/BaseLib/GetPowerOfTwo32.c
index 6dfe8056b4..dbf4ca6513 100644
--- a/MdePkg/Library/BaseLib/GetPowerOfTwo32.c
+++ b/MdePkg/Library/BaseLib/GetPowerOfTwo32.c
@@ -34,6 +34,7 @@ GetPowerOfTwo32 (
   )
 {
   INTN                              BitPos;
-
-  return (BitPos = HighBitSet32 (Operand)) > 0 ? 1ul << BitPos : 0;
+  
+  BitPos = HighBitSet32 (Operand);
+  return BitPos >= 0 ? 1ul << BitPos : 0;
 }
diff --git a/MdePkg/Library/BaseLib/GetPowerOfTwo64.c b/MdePkg/Library/BaseLib/GetPowerOfTwo64.c
index 9994fb8f12..8372a7f136 100644
--- a/MdePkg/Library/BaseLib/GetPowerOfTwo64.c
+++ b/MdePkg/Library/BaseLib/GetPowerOfTwo64.c
@@ -35,5 +35,6 @@ GetPowerOfTwo64 (
 {
   INTN                              BitPos;
 
-  return (BitPos = HighBitSet64 (Operand)) > 0 ? LShiftU64 (1, BitPos) : 0;
+  BitPos = HighBitSet64 (Operand);
+  return BitPos >= 0 ? LShiftU64 (1, BitPos) : 0;
 }