1 files changed, 2 insertions, 2 deletions
diff --git a/cpp/src/Slice/Preprocessor.cpp b/cpp/src/Slice/Preprocessor.cpp
index dd1260f2fa0..6c226c2db72 100644
--- a/cpp/src/Slice/Preprocessor.cpp
+++ b/cpp/src/Slice/Preprocessor.cpp
@@ -126,7 +126,7 @@ Slice::Preprocessor::preprocess(bool keepComments)
         args.push_back("-C");
     }
     args.push_back("-e");
-    args.push_back("utf8");
+    args.push_back("en_us.utf8");
     args.push_back(_fileName);
 
     const char** argv = new const char*[args.size() + 1];
@@ -230,7 +230,7 @@ Slice::Preprocessor::printMakefileDependencies(Language lang, const vector<strin
     vector<string> args = _args;
     args.push_back("-M");
     args.push_back("-e");
-    args.push_back("utf8");
+    args.push_back("en_us.utf8");
     args.push_back(_fileName);
 
     const char** argv = new const char*[args.size() + 1];