diff --git a/lib/output.js b/lib/output.js
index dca66691..e6ee9118 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -298,6 +298,7 @@ function OutputStream(options) {
                         might_need_semicolon = true;
                     }
                 }
+                LAST_OUTPUT_FRAGMENT = "";
 
                 if (!options.beautify)
                     might_need_space = false;
@@ -309,6 +310,7 @@ function OutputStream(options) {
             while (current_line < target_line) {
                 ensure_line_len();
                 OUTPUT += "\n";
+                LAST_OUTPUT_FRAGMENT = "";
                 current_pos++;
                 current_line++;
                 current_col = 0;
@@ -323,6 +325,7 @@ function OutputStream(options) {
                 || ((ch == "+" || ch == "-") && ch == last))
             {
                 OUTPUT += " ";
+                LAST_OUTPUT_FRAGMENT = "";
                 current_col++;
                 current_pos++;
             }