diff --git a/src/cpu/o3/dyn_inst.cc b/src/cpu/o3/dyn_inst.cc
index c5e54f1886..c0ace7cdae 100644
--- a/src/cpu/o3/dyn_inst.cc
+++ b/src/cpu/o3/dyn_inst.cc
@@ -191,6 +191,15 @@ DynInst::operator new(size_t count, Arrays &arrays)
     return buf;
 }
 
+// Because of the custom "new" operator that allocates more bytes than the
+// size of the DynInst object, AddressSanitizer throw new-delete-type-mismatch.
+// Adding a custom delete function is enough to shut down this false positive
+void
+DynInst::operator delete(void *ptr)
+{
+    ::operator delete(ptr);
+}
+
 DynInst::~DynInst()
 {
     /*
diff --git a/src/cpu/o3/dyn_inst.hh b/src/cpu/o3/dyn_inst.hh
index 3dae156eb1..9b46431b2d 100644
--- a/src/cpu/o3/dyn_inst.hh
+++ b/src/cpu/o3/dyn_inst.hh
@@ -104,6 +104,7 @@ class DynInst : public ExecContext, public RefCounted
     };
 
     static void *operator new(size_t count, Arrays &arrays);
+    static void  operator delete(void* ptr);
 
     /** BaseDynInst constructor given a binary instruction. */
     DynInst(const Arrays &arrays, const StaticInstPtr &staticInst,