diff --git a/lib/compress.js b/lib/compress.js
index df33a5c3..33f472ea 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -6423,7 +6423,7 @@ merge(Compressor.prototype, {
 
     OPT(AST_Dot, function(self, compressor) {
         if (self.property == "arguments" || self.property == "caller") {
-            compressor.warn("Function.protoype.{prop} not supported [{file}:{line},{col}]", {
+            compressor.warn("Function.prototype.{prop} not supported [{file}:{line},{col}]", {
                 prop: self.property,
                 file: self.start.file,
                 line: self.start.line,