diff --git a/lib/Backend/GlobOpt.cpp b/lib/Backend/GlobOpt.cpp
index 024455c09fa..f641ce2026b 100644
--- a/lib/Backend/GlobOpt.cpp
+++ b/lib/Backend/GlobOpt.cpp
@@ -16321,6 +16321,7 @@ GlobOpt::OptArraySrc(IR::Instr * *const instrRef)
     Value *headSegmentLengthValue = nullptr;
     IntConstantBounds headSegmentLengthConstantBounds;
 
+#if ENABLE_FAST_ARRAYBUFFER
     if (baseValueType.IsLikelyOptimizedVirtualTypedArray() && !Js::IsSimd128LoadStore(instr->m_opcode) /*Always extract bounds for SIMD */)
     {
         if (isProfilableStElem ||
@@ -16364,6 +16365,7 @@ GlobOpt::OptArraySrc(IR::Instr * *const instrRef)
             }
         }
     }
+#endif
 
     if(needsBoundChecks && DoBoundCheckElimination())
     {