diff --git a/src/coreclr/jit/assertionprop.cpp b/src/coreclr/jit/assertionprop.cpp
index 5ea3ba568406a3..280d1fef56dc07 100644
--- a/src/coreclr/jit/assertionprop.cpp
+++ b/src/coreclr/jit/assertionprop.cpp
@@ -1431,9 +1431,6 @@ AssertionIndex Compiler::optCreateAssertion(GenTree*         op1,
         assertion.op2.vn           = ValueNumStore::VNForNull();
         assertion.op2.u1.iconVal   = 0;
         assertion.op2.u1.iconFlags = GTF_EMPTY;
-#ifdef TARGET_64BIT
-        assertion.op2.u1.iconFlags |= GTF_ASSERTION_PROP_LONG; // Signify that this is really TYP_LONG
-#endif                                                         // TARGET_64BIT
     }
     //
     // Are we making an assertion about a local variable?
@@ -1568,13 +1565,6 @@ AssertionIndex Compiler::optCreateAssertion(GenTree*         op1,
 #endif // TARGET_ARM
                         assertion.op2.u1.iconVal   = op2->AsIntCon()->gtIconVal;
                         assertion.op2.u1.iconFlags = op2->GetIconHandleFlag();
-#ifdef TARGET_64BIT
-                        if (op2->TypeGet() == TYP_LONG || op2->TypeGet() == TYP_BYREF)
-                        {
-                            assertion.op2.u1.iconFlags |=
-                                GTF_ASSERTION_PROP_LONG; // Signify that this is really TYP_LONG
-                        }
-#endif // TARGET_64BIT
                     }
                     else if (op2->gtOper == GT_CNS_LNG)
                     {
@@ -1731,12 +1721,6 @@ AssertionIndex Compiler::optCreateAssertion(GenTree*         op1,
                 /* iconFlags should only contain bits in GTF_ICON_HDL_MASK */
                 assert((iconFlags & ~GTF_ICON_HDL_MASK) == 0);
                 assertion.op2.u1.iconFlags = iconFlags;
-#ifdef TARGET_64BIT
-                if (op2->AsOp()->gtOp1->TypeGet() == TYP_LONG)
-                {
-                    assertion.op2.u1.iconFlags |= GTF_ASSERTION_PROP_LONG; // Signify that this is really TYP_LONG
-                }
-#endif // TARGET_64BIT
             }
             // JIT case
             else if (optIsTreeKnownIntValue(!optLocalAssertionProp, op2, &cnsValue, &iconFlags))
@@ -1749,12 +1733,6 @@ AssertionIndex Compiler::optCreateAssertion(GenTree*         op1,
                 /* iconFlags should only contain bits in GTF_ICON_HDL_MASK */
                 assert((iconFlags & ~GTF_ICON_HDL_MASK) == 0);
                 assertion.op2.u1.iconFlags = iconFlags;
-#ifdef TARGET_64BIT
-                if (op2->TypeGet() == TYP_LONG)
-                {
-                    assertion.op2.u1.iconFlags |= GTF_ASSERTION_PROP_LONG; // Signify that this is really TYP_LONG
-                }
-#endif // TARGET_64BIT
             }
             else
             {
@@ -2047,13 +2025,9 @@ void Compiler::optDebugCheckAssertion(AssertionDsc* assertion)
         case O2K_IND_CNS_INT:
         case O2K_CONST_INT:
         {
-// The only flags that can be set are those in the GTF_ICON_HDL_MASK, or GTF_ASSERTION_PROP_LONG, which is
-// used to indicate a long constant.
-#ifdef TARGET_64BIT
-            assert((assertion->op2.u1.iconFlags & ~(GTF_ICON_HDL_MASK | GTF_ASSERTION_PROP_LONG)) == 0);
-#else
+            // The only flags that can be set are those in the GTF_ICON_HDL_MASK.
             assert((assertion->op2.u1.iconFlags & ~GTF_ICON_HDL_MASK) == 0);
-#endif
+
             switch (assertion->op1.kind)
             {
                 case O1K_EXACT_TYPE:
diff --git a/src/coreclr/jit/gentree.h b/src/coreclr/jit/gentree.h
index 6ef9cb3032e0af..7e1d4e7d720158 100644
--- a/src/coreclr/jit/gentree.h
+++ b/src/coreclr/jit/gentree.h
@@ -605,11 +605,6 @@ enum GenTreeFlags : unsigned int
 
     GTF_SIMDASHW_OP             = 0x80000000, // GT_HWINTRINSIC -- Indicates that the structHandle should be gotten from gtGetStructHandleForSIMD
                                               //                   rather than from gtGetStructHandleForHWSIMD.
-
-    // Flag used by assertion prop to indicate that a type is a TYP_LONG
-#ifdef TARGET_64BIT
-    GTF_ASSERTION_PROP_LONG     = 0x00000001,
-#endif // TARGET_64BIT
 };
 
 inline constexpr GenTreeFlags operator ~(GenTreeFlags a)