diff --git a/src/ast/ast.c b/src/ast/ast.c
index bcdc3ba..c2ddb60 100644
--- a/src/ast/ast.c
+++ b/src/ast/ast.c
@@ -182,6 +182,12 @@ AST *ast_deep_copy(AST *src) {
 		return memdup(src, sizeof(ASTExprVar));
 	} else if(src->nodeKind == AST_EXPR_PRIMITIVE) {
 		return memdup(src, sizeof(ASTExprPrimitive));
+	} else if(src->nodeKind == AST_EXPR_VAR) {
+		return memdup(src, sizeof(ASTExprVar));
+	} else if(src->nodeKind == AST_EXPR_UNARY_OP) {
+		ASTExprUnaryOp *n = memdup(src, sizeof(ASTExprUnaryOp));
+		n->operand = ast_deep_copy(n->operand);
+		return n;
 	}
 	
 	abort();