diff --git a/nodes/PrimitiveTypeNode.cc b/nodes/PrimitiveTypeNode.cc
index f0d2822..15587e7 100644
--- a/nodes/PrimitiveTypeNode.cc
+++ b/nodes/PrimitiveTypeNode.cc
@@ -8,28 +8,30 @@ string PrimitiveTypeNode::getString()
 {
     switch (m_integer)
     {
-    case BYTE:
-        return "int8_t";
-    case UBYTE:
-        return "uint8_t";
-    case CHAR:
-        return "char";
-    case WCHAR:
-        return "wchar_t";
-    case SHORT:
-        return "int16_t";
-    case USHORT:
-        return "uint16_t";
-    case INT:
-        return "int32_t";
-    case UINT:
-        return "uint32_t";
-    case LONG:
-        return "int64_t";
-    case ULONG:
-        return "uint64_t";
-    default:
-        cerr << "Error: Unknown primitive type " << m_integer << endl;
-        return "<UNKNOWN-TYPE>";
+        case BOOL:
+            return "uint8_t";
+        case BYTE:
+            return "int8_t";
+        case UBYTE:
+            return "uint8_t";
+        case CHAR:
+            return "char";
+        case WCHAR:
+            return "wchar_t";
+        case SHORT:
+            return "int16_t";
+        case USHORT:
+            return "uint16_t";
+        case INT:
+            return "int32_t";
+        case UINT:
+            return "uint32_t";
+        case LONG:
+            return "int64_t";
+        case ULONG:
+            return "uint64_t";
+        default:
+            cerr << "Error: Unknown primitive type " << m_integer << endl;
+            return "<UNKNOWN-TYPE>";
     }
 }
diff --git a/parser/parser.lex b/parser/parser.lex
index e04c632..8ffabff 100644
--- a/parser/parser.lex
+++ b/parser/parser.lex
@@ -86,6 +86,7 @@ static uint64_t parseInt(const char * text, int base)
 }
 
     /* primitive types */
+bool        return BOOL;
 byte        return BYTE;
 ubyte       return UBYTE;
 char        return CHAR;
@@ -101,10 +102,12 @@ double      return DOUBLE;
 
     /* keywords */
 c           return C;
+false       return FALSE;
 import      return IMPORT;
 module      return MODULE;
 return      return RETURN;
 struct      return STRUCT;
+true        return TRUE;
 
     /* identifiers */
 [a-zA-Z_][a-zA-Z_0-9]* {
diff --git a/parser/parser.yy b/parser/parser.yy
index 7bf308f..b9ce280 100644
--- a/parser/parser.yy
+++ b/parser/parser.yy
@@ -64,6 +64,7 @@ static YYSTYPE parse_result;
 %token STRING_LITERAL;
 
     /* primitive types */
+%token BOOL;
 %token BYTE;
 %token UBYTE;
 %token CHAR;
@@ -79,10 +80,12 @@ static YYSTYPE parse_result;
 
     /* keywords */
 %token C;
+%token FALSE;
 %token IMPORT;
 %token MODULE;
 %token RETURN;
 %token STRUCT;
+%token TRUE;
 
     /* identifiers */
 %token IDENTIFIER;