diff --git a/parse.leg b/parse.leg
index 73c1e1b..64ad231 100644
--- a/parse.leg
+++ b/parse.leg
@@ -588,16 +588,12 @@ oop newTry(oop try, oop exception, oop catch, oop finally)
     return obj;
 }
 
-#define YY_INPUT(buf, result, max_size)                                 \
+#define YY_INPUT(yy, buf, result, max_size)                              \
 {                                                                       \
     int yyc= feof(inputStack->file) ? EOF : getc(inputStack->file);     \
     result= (EOF == yyc) ? 0 : (*(buf)= yyc, 1);                        \
 }
 
-#define YYSTYPE oop
-
-YYSTYPE yylval;
-
 int errorLine= 1;
 
 void syntaxError(char *text)
@@ -608,9 +604,17 @@ void syntaxError(char *text)
 
 oop eval(oop scope, oop ast);
 
-struct _yycontext;
+#define YYSTYPE oop
+
+YYSTYPE yylval;
+
+#define YY_ACTION(T) static T
 
-int yyparsefrom(int (*yystart)(struct _yycontext *yy));
+#define YY_CTX_LOCAL 1
+
+#define YYPARSEFROM yymeta_parsefrom
+#define YYPARSE     yymeta_parse
+#define YYRELEASE   yymeta_release
 
 %}
 
@@ -2017,7 +2021,7 @@ oop evalArgs(oop scope, oop asts)
 
 oop AST= NULL;
 
-void readEvalPrint(oop scope, char *fileName)
+void readEvalPrint(yycontext *yy, oop scope, char *fileName)
 {
     inputStackPush(fileName);
     input_t *top= inputStack;
@@ -2026,7 +2030,7 @@ void readEvalPrint(oop scope, char *fileName)
     int jbt= sigsetjmp(jbs->jb, 0);
 
     if (0 == jbt) {
-        while (yyparse()) {
+        while (YYPARSE(yy)) {
             if (opt_v > 1) printf("%s:%i: ", get(inputStack->name, String, value), inputStack->lineNumber);
             if (!yylval) {
                 fclose(inputStack->file);
@@ -2059,13 +2063,16 @@ void readEvalPrint(oop scope, char *fileName)
 
 oop prim_import(oop scope, oop params)
 {
+    yycontext yy, *yyctx = &yy;
+    memset(yyctx, 0, sizeof(yy));
+
     if (map_hasIntegerKey(params, 0)) {
         char *file= get(get(params, Map, elements)[0].value, String, value);
         if (yyctx->__pos < yyctx->__limit) {
             yyctx->__limit--;
             ungetc(yyctx->__buf[yyctx->__limit], inputStack->file);
         }
-        readEvalPrint(scope, file);
+        readEvalPrint(yyctx, scope, file);
     }
     return null;
 }
@@ -2314,7 +2321,7 @@ oop prim_microseconds(oop scope, oop params)
     return makeInteger(ru.ru_utime.tv_sec * 1000*1000 + ru.ru_utime.tv_usec);
 }
 
-int main(int argc, char **argv)
+void meta_init(void)
 {
 # if (USE_GC)
     GC_INIT();
@@ -2364,6 +2371,13 @@ int main(int argc, char **argv)
     #undef _DO
 
     fixScope(globals);
+}
+
+int main(int argc, char **argv)
+{
+    meta_init();
+
+    yycontext yy;
 
     int repled = 0;
     while (argc-- > 1) {
@@ -2371,16 +2385,19 @@ int main(int argc, char **argv)
         if      (!strcmp(*argv, "-g"))  ++opt_g;
         else if (!strcmp(*argv, "-v"))  ++opt_v;
         else if (!strcmp(*argv, "-")) {
-            readEvalPrint(globals, NULL);
+            memset(&yy, 0, sizeof(yy));
+            readEvalPrint(&yy, globals, NULL);
             repled= 1;
         }
         else {
-            readEvalPrint(globals, *argv);
+            memset(&yy, 0, sizeof(yy));
+            readEvalPrint(&yy, globals, *argv);
             repled= 1;
         }
     }
     if (!repled) {
-        readEvalPrint(globals, NULL);
+        memset(&yy, 0, sizeof(yy));
+        readEvalPrint(&yy, globals, NULL);
     }
 
     if (opt_g) {