diff --git a/CheckOther.cpp b/CheckOther.cpp
index 262a5301f..f889d11a0 100644
--- a/CheckOther.cpp
+++ b/CheckOther.cpp
@@ -1,4 +1,4 @@
-/*
+/*
  * c++check - c/c++ syntax checking
  * Copyright (C) 2007 Daniel Marjamäki
  *
@@ -894,7 +894,7 @@ void CheckOther::functionVariableUsage()
 
             if (TOKEN::Match(tok, "-=|+=|*=|/= %var%"))
                 varUsage[ tok->strAt(1) ] |= USAGE_READ;
-
+
             if (TOKEN::Match(tok, "%var%") && (tok->next()->str()==")" || isOp(tok->next())))
                 varUsage[ tok->str() ] |= USAGE_READ;
 
@@ -908,7 +908,7 @@ void CheckOther::functionVariableUsage()
             std::string varname = it->first;
             unsigned int usage = it->second;
 
-            if (!isalpha(varname[0]))
+            if (!std::isalpha(varname[0]))
                 continue;
 
             if ( ! ( usage & USAGE_DECLARE ) )