diff --git a/src/ast/ast.c b/src/ast/ast.c
index f513690..ce85230 100644
--- a/src/ast/ast.c
+++ b/src/ast/ast.c
@@ -238,7 +238,8 @@ AST *ast_cast_expr(AST *what, Type *to) {
 			ASTExprPrimitive *ret = calloc(1, sizeof(*ret));
 			ret->nodeKind = AST_EXPR_PRIMITIVE;
 			ret->type = to;
-			memcpy(&ret->val, what->exprStrLit.data, sizeof(ret->val));
+			ret->val = 0;
+			memcpy(&ret->val, what->exprStrLit.data, what->exprStrLit.length);
 			return (AST*) ret;
 		} else abort();
 	}