diff --git a/lib/output.js b/lib/output.js
index 73b55865..70964125 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -315,7 +315,7 @@ function OutputStream(options) {
 
                   // Fixes offsets for quoted keys of object literals
                   remainder = token.endpos - token.pos - tokenName.length;
-                  offset = remainder === 0 ? 0 : remainder/2;
+                  offset = remainder === 0 ? 0 : 1;
                 }
 
                 options.source_map.add(