diff --git a/UnitTestFrameworkPkg/Library/CmockaLib/CmockaLib.inf b/UnitTestFrameworkPkg/Library/CmockaLib/CmockaLib.inf
index 07da7a88e9..052c7f5572 100644
--- a/UnitTestFrameworkPkg/Library/CmockaLib/CmockaLib.inf
+++ b/UnitTestFrameworkPkg/Library/CmockaLib/CmockaLib.inf
@@ -26,7 +26,7 @@
   UnitTestFrameworkPkg/UnitTestFrameworkPkg.dec
 
 [BuildOptions]
-  MSFT:*_*_*_CC_FLAGS     == /c -DHAVE_VSNPRINTF -DHAVE_SNPRINTF
+  MSFT:*_*_*_CC_FLAGS     == /c -DHAVE_VSNPRINTF -DHAVE_SNPRINTF /Zi
   MSFT:NOOPT_*_*_CC_FLAGS =  /Od
 
   GCC:*_*_*_CC_FLAGS     == -g -DHAVE_SIGNAL_H