1 files changed, 6 insertions, 2 deletions
diff --git a/cpp/src/slice2freeze/Main.cpp b/cpp/src/slice2freeze/Main.cpp
index 2d2020f10a2..bc855817352 100644
--- a/cpp/src/slice2freeze/Main.cpp
+++ b/cpp/src/slice2freeze/Main.cpp
@@ -1454,7 +1454,11 @@ gen(const string& name, const UnitPtr& u, const vector<string>& includePaths, co
         }
     }
 
-    H << "#pragma once\n";
+    string s = fileH;
+    transform(s.begin(), s.end(), s.begin(), ToIfdef());
+    H << "\n#ifndef __" << s << "__";
+    H << "\n#define __" << s << "__";
+    H << '\n';
 
     if(dicts.size() > 0)
     {
@@ -1503,7 +1507,7 @@ gen(const string& name, const UnitPtr& u, const vector<string>& includePaths, co
         }
     }
 
-    H << "\n\n";
+    H << "\n\n#endif\n";
     CPP << '\n';
 
     H.close();