diff --git a/parser/parser.lex b/parser/parser.lex
index 04b5295..7018fbd 100644
--- a/parser/parser.lex
+++ b/parser/parser.lex
@@ -71,4 +71,6 @@ width               return WIDTH;
 \n                  /* ignore newlines */
 [ \t\v]             /* ignore whitespace */
 
+.                   return -1;
+
 %%
diff --git a/parser/parser.yy b/parser/parser.yy
index 4656c28..b99dd86 100644
--- a/parser/parser.yy
+++ b/parser/parser.yy
@@ -10,14 +10,13 @@
 #include "parser.tab.hh"        /* bison-generated header with YY[SL]TYPE */
 using namespace std;
 
+#define yyerror(msg) errFunc(msg, &yylloc)
+
 int yylex(YYSTYPE *, YYLTYPE *);
 
 extern FILE * yyin;
 
-void yyerror(const char * str)
-{
-    fprintf(stderr, "error: %s\n", str);
-}
+void errFunc(const char * str, YYLTYPE * yyllocp);
 
 int yywrap()
 {
@@ -398,6 +397,18 @@ refptr<Node> parse(const char * fileName)
         cerr << "Failed to open file '" << fileName << "'" << endl;
         return refptr<Node>(NULL);
     }
-    yyparse();
+    if (yyparse())
+    {
+        cerr << "Aborting." << endl;
+        exit(1);
+    }
     return parsed_scene_node;
 }
+
+void errFunc(const char * str, YYLTYPE * yyllocp)
+{
+    fprintf(stderr, "error: %s: line %d, column %d\n",
+        str,
+        yyllocp->first_line,
+        yyllocp->first_column);
+}