diff --git a/src/runtime/c/pgf/expr.cxx b/src/runtime/c/pgf/expr.cxx
index 8c0c5633f..dc8f4b316 100644
--- a/src/runtime/c/pgf/expr.cxx
+++ b/src/runtime/c/pgf/expr.cxx
@@ -339,6 +339,8 @@ void PgfExprParser::str_char()
         case 't':
             putc('\t');
             break;
+        case '0':
+            puts("\0");
         default:
             return;
         }