diff --git a/src/ram.l b/src/ram.l
index c5c3892..345fa84 100644
--- a/src/ram.l
+++ b/src/ram.l
@@ -9,11 +9,11 @@
 
 
 %%
-[rio][0-9]*         { yylval = yytext; return REGISTER;}
-[rio]@[rio][0-9]*   { yylval = yytext; return REGISTER_REF;}
-[0-9]*              { yylval = yytext; return VALUE;}
-ADD|SUB|MULT|DIV    { yylval = yytext; return OP;}
-JUMP|JE|JL          { yylval = yytext; return OP_CTRL;}
+[rio][0-9]*         { yylval = strdup(yytext); return REGISTER;}
+[rio]@[rio][0-9]*   { yylval = strdup(yytext); return REGISTER_REF;}
+[0-9]*              { yylval = strdup(yytext); return VALUE;}
+ADD|SUB|MULT|DIV    { yylval = strdup(yytext); return OP;}
+JUMP|JE|JL          { yylval = strdup(yytext); return OP_CTRL;}
 [ ]*,[ ]*           {return COMMA;}
 \(                  {return PAR_O;}
 \)                  {return PAR_C;}