diff --git a/opt.cpp b/opt.cpp
index 781835d1..2995f97d 100644
--- a/opt.cpp
+++ b/opt.cpp
@@ -108,6 +108,9 @@
   #include <llvm/Analysis/TargetTransformInfo.h>
 #endif
 #include <llvm/Target/TargetMachine.h>
+#if ISPC_LLVM_VERSION >= ISPC_LLVM_3_8 // LLVM 3.8+
+  #include <llvm/Analysis/BasicAliasAnalysis.h>
+#endif
 #include <llvm/Analysis/Passes.h>
 #include <llvm/Support/raw_ostream.h>
 #include <llvm/Support/Dwarf.h>