diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index 76acda1..7e68dbc 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -325,11 +325,6 @@
   return tok_int_constant;
 }
 
-{dubconstant} {
-  yylval.dconst = atof(yytext);
-  return tok_dub_constant;
-}
-
 {identifier} {
   yylval.id = strdup(yytext);
   return tok_identifier;
@@ -340,6 +335,12 @@
   return tok_st_identifier;
 }
 
+{dubconstant} {
+ /* Deliberately placed after identifier, since "e10" is NOT a double literal (THRIFT-3477) */
+  yylval.dconst = atof(yytext);
+  return tok_dub_constant;
+}
+
 {literal_begin} {
   char mark = yytext[0];
   std::string result;