diff --git a/lib/ExecutionEngine/Compiler.h b/lib/ExecutionEngine/Compiler.h
index 863cda6..7be02ba 100644
--- a/lib/ExecutionEngine/Compiler.h
+++ b/lib/ExecutionEngine/Compiler.h
@@ -46,7 +46,7 @@
 
 namespace bcc {
   class ScriptCompiled;
-  struct CompilerOption;
+  class CompilerOption;
 
   class Compiler {
   private:
diff --git a/lib/ExecutionEngine/Script.h b/lib/ExecutionEngine/Script.h
index 0560f55..fd39c80 100644
--- a/lib/ExecutionEngine/Script.h
+++ b/lib/ExecutionEngine/Script.h
@@ -38,7 +38,7 @@
   class ScriptCompiled;
   class ScriptCached;
   class SourceInfo;
-  struct CompilerOption;
+  class CompilerOption;
 
   namespace ScriptStatus {
     enum StatusType {
diff --git a/lib/ExecutionEngine/ScriptCompiled.h b/lib/ExecutionEngine/ScriptCompiled.h
index 5c442c7..a2c601c 100644
--- a/lib/ExecutionEngine/ScriptCompiled.h
+++ b/lib/ExecutionEngine/ScriptCompiled.h
@@ -33,7 +33,7 @@
 }
 
 namespace bcc {
-  struct CompilerOption;
+  class CompilerOption;
 
   class ScriptCompiled {
     friend class Compiler;