Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -10036,9 +10036,11 @@
     }
   } else if (const auto *ArrayTy = S.Context.getAsArrayType(LHSTy)) {
     QualType ArrayElemTy = ArrayTy->getElementType();
+    if (RHSTy->isReferenceType())
+      RHSTy = RHSTy->getPointeeType();
     if (ArrayElemTy != S.Context.getBaseElementType(ArrayTy) ||
         ArrayElemTy->isDependentType() || RHSTy->isDependentType() ||
-        RHSTy->isReferenceType() || ArrayElemTy->isCharType() ||
+        ArrayElemTy->isCharType() ||
         S.Context.getTypeSize(ArrayElemTy) == S.Context.getTypeSize(RHSTy))
       return;
     S.Diag(Loc, diag::warn_division_sizeof_array)
Index: clang/test/Sema/div-sizeof-array.cpp
===================================================================
--- clang/test/Sema/div-sizeof-array.cpp
+++ clang/test/Sema/div-sizeof-array.cpp
@@ -46,4 +46,8 @@
   int array[10];
   int narray = sizeof(array) / sizeof(int &);
   int narray2 = sizeof(array) / sizeof(decltype(array[0]));
+
+  int *arrptrs[10];                                          // expected-note {{array 'arrptrs' declared here}}
+  int len = sizeof(arrptrs) / sizeof(decltype(*arrptrs[0])); // expected-warning {{expression does not compute the number of elements in this array; element type is 'int *', not 'int'}}
+  // expected-note@-1 {{place parentheses around the 'sizeof(decltype(*arrptrs[0]))' expression to silence this warning}}
 }