diff --git a/parser/html/nsHtml5Tokenizer.cpp b/parser/html/nsHtml5Tokenizer.cpp
index 444c93132..2f60fcc6d 100644
--- a/parser/html/nsHtml5Tokenizer.cpp
+++ b/parser/html/nsHtml5Tokenizer.cpp
@@ -599,7 +599,6 @@ nsHtml5Tokenizer::stateLoop(int32_t state, char16_t c, int32_t pos, char16_t* bu
                 containsHyphen = true;
               }
               appendStrBuf(c);
-              containsHyphen = false;
               continue;
             }
           }