diff --git a/lib/checkunusedvar.cpp b/lib/checkunusedvar.cpp
index a2487694f..ad9df56f1 100644
--- a/lib/checkunusedvar.cpp
+++ b/lib/checkunusedvar.cpp
@@ -1401,7 +1401,7 @@ bool CheckUnusedVar::isRecordTypeWithoutSideEffects(const Type* type)
     // a type that has no side effects (no constructors and no members with constructors)
     /** @todo false negative: check constructors for side effects */
 
-    const std::pair<std::map<const Type *,bool>::iterator,bool> found=isRecordTypeWithoutSideEffectsMap.insert(
+    const std::pair<std::map<const Type *,bool>::iterator,bool> found=mIsRecordTypeWithoutSideEffectsMap.insert(
                 std::pair<const Type *,bool>(type,false)); //Initialize with side effects for possible recursions
     bool & withoutSideEffects=found.first->second;
     if (!found.second)
@@ -1427,7 +1427,7 @@ bool CheckUnusedVar::isEmptyType(const Type* type)
 {
     // a type that has no variables and no constructor
 
-    const std::pair<std::map<const Type *,bool>::iterator,bool> found=isEmptyTypeMap.insert(
+    const std::pair<std::map<const Type *,bool>::iterator,bool> found=mIsEmptyTypeMap.insert(
                 std::pair<const Type *,bool>(type,false));
     bool & emptyType=found.first->second;
     if (!found.second)
diff --git a/lib/checkunusedvar.h b/lib/checkunusedvar.h
index ac09f7237..1eef17c70 100644
--- a/lib/checkunusedvar.h
+++ b/lib/checkunusedvar.h
@@ -112,9 +112,9 @@ private:
                "- unused struct member\n";
     }
 
-    std::map<const Type *,bool> isRecordTypeWithoutSideEffectsMap;
+    std::map<const Type *,bool> mIsRecordTypeWithoutSideEffectsMap;
 
-    std::map<const Type *,bool> isEmptyTypeMap;
+    std::map<const Type *,bool> mIsEmptyTypeMap;
 
 };
 /// @}