diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.c b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
index df91c1451c..a88b7f1ec4 100644
--- a/MdeModulePkg/Application/VariableInfo/VariableInfo.c
+++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
@@ -104,6 +104,7 @@ PrintInfoFromSmm (
   }
 
   CommBuffer = NULL;
+  RealCommSize = 0;
   Status = EfiGetSystemConfigurationTable (
              &gEdkiiPiSmmCommunicationRegionTableGuid,
              (VOID **) &PiSmmCommunicationRegionTable