diff --git a/token.cpp b/token.cpp
index 030872d34..2829207de 100644
--- a/token.cpp
+++ b/token.cpp
@@ -37,6 +37,7 @@ TOKEN::TOKEN()
     _varId = 0;
     _isName = false;
     _isNumber = false;
+    _isBoolean = false;
 }
 
 TOKEN::~TOKEN()
@@ -55,6 +56,11 @@ void TOKEN::setstr( const char s[] )
 #endif
     _isName = bool(_str[0]=='_' || isalpha(_str[0]));
     _isNumber = bool(isdigit(_str[0]) != 0);
+    if( _str == "true" || _str == "false" )
+        _isBoolean = true;
+    else
+        _isBoolean = false;
+
     _varId = 0;
 }
 
@@ -227,10 +233,15 @@ bool TOKEN::Match(const TOKEN *tok, const char pattern[], const char *varname1[]
 
         else if (strcmp(str,"%num%")==0)
         {
-            if ( ! tok->isNumber() )
+            if ( !tok->isNumber() )
                 return false;
         }
 
+        else if (strcmp(str,"%bool%")==0)
+        {
+            if ( !tok->isBoolean() )
+                return false;
+        }
 
         else if (strcmp(str,"%str%")==0)
         {
@@ -297,6 +308,11 @@ bool TOKEN::isNumber() const
     return _isNumber;
 }
 
+bool TOKEN::isBoolean() const
+{
+    return _isBoolean;
+}
+
 bool TOKEN::isStandardType() const
 {
     bool ret = false;
diff --git a/token.h b/token.h
index 0beb83a07..a301d9340 100644
--- a/token.h
+++ b/token.h
@@ -68,6 +68,7 @@ public:
      * "%any%" any token
      * "%var%" any token which is a name or type e.g. "hello" or "int"
      * "%num%" Any numeric token, e.g. "23"
+     * "%bool%" true or false
      * "%str%" Any token starting with "-character (C-string).
      * "%var1%" Match with parameter varname1
      * "%var2%" Match with parameter varname2
@@ -96,6 +97,7 @@ public:
 
     bool isName() const;
     bool isNumber() const;
+    bool isBoolean() const;
     bool isStandardType() const;
     static const TOKEN *findmatch(const TOKEN *tok, const char pattern[], const char *varname1[]=0, const char *varname2[]=0);
 
@@ -172,6 +174,7 @@ private:
     char * _cstr;
     bool _isName;
     bool _isNumber;
+    bool _isBoolean;
     unsigned int _varId;
     TOKEN *_next;
     TOKEN *_previous;
diff --git a/tokenize.cpp b/tokenize.cpp
index ac6b23609..1c7b6a680 100644
--- a/tokenize.cpp
+++ b/tokenize.cpp
@@ -1200,8 +1200,10 @@ bool Tokenizer::simplifyKnownVariables()
 
         // parse the block of code..
         int indentlevel = 0;
+
         for ( TOKEN *tok2 = tok; tok2; tok2 = tok2->next() )
         {
+
             if ( tok2->str() == "{" )
                 ++indentlevel;
 
@@ -1212,7 +1214,8 @@ bool Tokenizer::simplifyKnownVariables()
                     continue;
             }
 
-            else if ( TOKEN::Match(tok2, "%var% = %num% ;") )
+            else if ( TOKEN::Match(tok2, "%var% = %num% ;") ||
+                      TOKEN::Match(tok2, "%var% = %bool% ;"))
             {
                 unsigned int varid = tok2->varId();
                 for ( TOKEN *tok3 = tok2->next(); tok3; tok3 = tok3->next() )