diff --git a/src/Reactor/LLVMJIT.cpp b/src/Reactor/LLVMJIT.cpp
index 012e2f1..6fe0ff2 100644
--- a/src/Reactor/LLVMJIT.cpp
+++ b/src/Reactor/LLVMJIT.cpp
@@ -899,13 +899,6 @@
 		pm = pb.buildO0DefaultPipeline(llvm::OptimizationLevel::O0);
 	}
 
-	if(__has_feature(memory_sanitizer) && msanInstrumentation)
-	{
-		llvm::MemorySanitizerOptions msanOpts(0 /* TrackOrigins */, false /* Recover */, false /* Kernel */, true /* EagerChecks */);
-		pm.addPass(llvm::ModuleMemorySanitizerPass(msanOpts));
-		pm.addPass(llvm::createModuleToFunctionPassAdaptor(llvm::MemorySanitizerPass(msanOpts)));
-	}
-
 	if(optimizationLevel > 0)
 	{
 		fpm.addPass(llvm::SROAPass());
@@ -917,6 +910,13 @@
 		pm.addPass(llvm::createModuleToFunctionPassAdaptor(std::move(fpm)));
 	}
 
+	if(__has_feature(memory_sanitizer) && msanInstrumentation)
+	{
+		llvm::MemorySanitizerOptions msanOpts(0 /* TrackOrigins */, false /* Recover */, false /* Kernel */, true /* EagerChecks */);
+		pm.addPass(llvm::ModuleMemorySanitizerPass(msanOpts));
+		pm.addPass(llvm::createModuleToFunctionPassAdaptor(llvm::MemorySanitizerPass(msanOpts)));
+	}
+
 	pm.run(*module, mam);
 #else  // Legacy pass manager
 	llvm::legacy::PassManager passManager;
@@ -931,17 +931,17 @@
 		passManager.add(llvm::createCoroCleanupLegacyPass());
 	}
 
-	if(__has_feature(memory_sanitizer) && msanInstrumentation)
-	{
-		passManager.add(llvm::createMemorySanitizerLegacyPassPass());
-	}
-
 	if(optimizationLevel > 0)
 	{
 		passManager.add(llvm::createSROAPass());
 		passManager.add(llvm::createInstructionCombiningPass());
 	}
 
+	if(__has_feature(memory_sanitizer) && msanInstrumentation)
+	{
+		passManager.add(llvm::createMemorySanitizerLegacyPassPass());
+	}
+
 	passManager.run(*module);
 #endif
 }