diff --git a/src/Sema.zig b/src/Sema.zig
index 8b476d4542a140edb6d9212fc178d771b0dbf028..cdbd8f8b41649cf93bd9bc27852fbe2cfc14278c 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -4712,6 +4712,11 @@ fn zirValidateDeref(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileErr
         .Slice => return sema.fail(block, src, "index syntax required for slice type '{}'", .{operand_ty.fmt(sema.mod)}),
     }
 
+    if ((try sema.typeHasOnePossibleValue(operand_ty.childType())) != null) {
+        // No need to validate the actual pointer value, we don't need it!
+        return;
+    }
+
     const elem_ty = operand_ty.elemType2();
     if (try sema.resolveMaybeUndefVal(operand)) |val| {
         if (val.isUndef()) {
diff --git a/test/behavior/comptime_memory.zig b/test/behavior/comptime_memory.zig
index 71d177395bdb82815402be50e6a6d0873ca8bb93..98e6e65725442461ef89bad8e69da845b13225a8 100644
--- a/test/behavior/comptime_memory.zig
+++ b/test/behavior/comptime_memory.zig
@@ -420,3 +420,11 @@ test "mutate entire slice at comptime" {
         buf[1..3].* = x;
     }
 }
+
+test "dereference undefined pointer to zero-bit type" {
+    const p0: *void = undefined;
+    try testing.expectEqual({}, p0.*);
+
+    const p1: *[0]u32 = undefined;
+    try testing.expect(p1.*.len == 0);
+}