diff --git a/IDEHelper/Compiler/CeMachine.cpp b/IDEHelper/Compiler/CeMachine.cpp
index 872ca3f3..dae24555 100644
--- a/IDEHelper/Compiler/CeMachine.cpp
+++ b/IDEHelper/Compiler/CeMachine.cpp
@@ -4628,7 +4628,7 @@ bool CeContext::Execute(CeFunction* startFunction, uint8* startStackPtr, uint8*
 					return false;
 				}
 
-				if (paramIdx < 0 || paramIdx > methodInstance->mParams.mSize)
+				if (paramIdx < 0 || paramIdx >= methodInstance->mParams.mSize)
 				{
 					_Fail("paramIdx is out of range");
 					return false;