diff --git a/src/update_engine/omaha_request_action.cc b/src/update_engine/omaha_request_action.cc
index 7af3d47..5a3cb83 100644
--- a/src/update_engine/omaha_request_action.cc
+++ b/src/update_engine/omaha_request_action.cc
@@ -41,8 +41,8 @@ static const char* kTagMaxFailureCountPerUrl = "MaxFailureCountPerUrl";
 // Deprecated: "MetadataSize"
 // Deprecated: "MoreInfo"; See https://github.com/google/omaha/blob/main/doc/ServerProtocolV2.md
 // "And on the Mac, the Google Software Update Agent supports the following optional attributes": Prompt, MoreInfo
+// Deprecated: "Prompt"
 static const char* kTagNeedsAdmin = "needsadmin";
-static const char* kTagPrompt = "Prompt";
 static const char* kTagSha256 = "sha256";
 
 namespace {
@@ -593,7 +593,6 @@ bool OmahaRequestAction::ParseParams(xmlDoc* doc,
   // Get the optional properties one by one.
   output_object->needs_admin =
       XmlGetProperty(pie_action_node, kTagNeedsAdmin) == "true";
-  output_object->prompt = XmlGetProperty(pie_action_node, kTagPrompt) == "true";
 
   string max = XmlGetProperty(pie_action_node, kTagMaxFailureCountPerUrl);
   if (!strings::StringToUint(max, &output_object->max_failure_count_per_url))
diff --git a/src/update_engine/omaha_request_action_unittest.cc b/src/update_engine/omaha_request_action_unittest.cc
index 43d3c50..de4e926 100644
--- a/src/update_engine/omaha_request_action_unittest.cc
+++ b/src/update_engine/omaha_request_action_unittest.cc
@@ -69,7 +69,6 @@ string GetNoUpdateResponse(const string& app_id) {
 
 string GetUpdateResponse2(const string& app_id,
                           const string& display_version,
-                          const string& prompt,
                           const string& codebase,
                           const string& filename,
                           const string& hash,
@@ -86,7 +85,6 @@ string GetUpdateResponse2(const string& app_id,
       "<packages><package hash=\"not-used\" name=\"" + filename +  "\" "
       "size=\"" + size + "\"/></packages>"
       "<actions><action event=\"postinstall\" "
-      "Prompt=\"" + prompt + "\" "
       "IsDelta=\"true\" "
       "IsDeltaPayload=\"true\" "
       "sha256=\"" + hash + "\" "
@@ -98,7 +96,6 @@ string GetUpdateResponse2(const string& app_id,
 
 string GetUpdateResponse(const string& app_id,
                          const string& display_version,
-                         const string& prompt,
                          const string& codebase,
                          const string& filename,
                          const string& hash,
@@ -106,7 +103,6 @@ string GetUpdateResponse(const string& app_id,
                          const string& size) {
   return GetUpdateResponse2(app_id,
                             display_version,
-                            prompt,
                             codebase,
                             filename,
                             hash,
@@ -208,7 +204,6 @@ TEST(OmahaRequestActionTest, ValidUpdateTest) {
                       GetDefaultTestParams(),
                       GetUpdateResponse(OmahaRequestParams::kAppId,
                                         "1.2.3.4",  // version
-                                        "true",  // prompt
                                         "http://code/base/",  // dl url
                                         "file.signed", // file name
                                         "HASH1234=",  // checksum
@@ -226,7 +221,6 @@ TEST(OmahaRequestActionTest, ValidUpdateTest) {
   EXPECT_EQ("HASH1234=", response.hash);
   EXPECT_EQ(123, response.size);
   EXPECT_FALSE(response.needs_admin);
-  EXPECT_TRUE(response.prompt);
 }
 
 TEST(OmahaRequestActionTest, NoOutputPipeTest) {
@@ -343,7 +337,6 @@ TEST(OmahaRequestActionTest, MissingFieldTest) {
       "<packages><package hash=\"not-used\" name=\"f\" "
       "size=\"587\"/></packages>"
       "<actions><action event=\"postinstall\" "
-      "Prompt=\"false\" "
       "IsDelta=\"true\" "
       "IsDeltaPayload=\"false\" "
       "sha256=\"lkq34j5345\" "
@@ -366,7 +359,6 @@ TEST(OmahaRequestActionTest, MissingFieldTest) {
   EXPECT_EQ("lkq34j5345", response.hash);
   EXPECT_EQ(587, response.size);
   EXPECT_TRUE(response.needs_admin);
-  EXPECT_FALSE(response.prompt);
 }
 
 TEST(OmahaRequestActionTest, ConcatUrlSlashTest) {
@@ -381,7 +373,6 @@ TEST(OmahaRequestActionTest, ConcatUrlSlashTest) {
       "<packages><package hash=\"not-used\" name=\"f\" "
       "size=\"587\"/></packages>"
       "<actions><action event=\"postinstall\" "
-      "Prompt=\"false\" "
       "IsDelta=\"true\" "
       "IsDeltaPayload=\"false\" "
       "sha256=\"lkq34j5345\" "
@@ -496,7 +487,6 @@ TEST(OmahaRequestActionTest, XmlDecodeTest) {
                       GetDefaultTestParams(),
                       GetUpdateResponse(OmahaRequestParams::kAppId,
                                         "1.2.3.4",  // version
-                                        "true",  // prompt
                                         "testthe&amp;codebase/",  // dl url
                                         "file.signed", // file name
                                         "HASH1234=", // checksum
@@ -518,7 +508,6 @@ TEST(OmahaRequestActionTest, ParseIntTest) {
                       GetDefaultTestParams(),
                       GetUpdateResponse(OmahaRequestParams::kAppId,
                                         "1.2.3.4",  // version
-                                        "true",  // prompt
                                         "thecodebase/",  // dl url
                                         "file.signed", // file name
                                         "HASH1234=", // checksum
diff --git a/src/update_engine/omaha_response.h b/src/update_engine/omaha_response.h
index d027e38..9d22349 100644
--- a/src/update_engine/omaha_response.h
+++ b/src/update_engine/omaha_response.h
@@ -23,7 +23,6 @@ struct OmahaResponse {
         size(0),
         max_failure_count_per_url(0),
         needs_admin(false),
-        prompt(false),
         is_delta_payload(false),
         disable_payload_backoff(false) {}
 
@@ -47,7 +46,6 @@ struct OmahaResponse {
   // Omaha Response attribute, if ever we need to fine tune the behavior.
   uint32_t max_failure_count_per_url;
   bool needs_admin;
-  bool prompt;
 
   // True if the payload described in this response is a delta payload.
   // False if it's a full payload.
diff --git a/src/update_engine/omaha_response_handler_action_unittest.cc b/src/update_engine/omaha_response_handler_action_unittest.cc
index 0b5d5a5..dfff580 100644
--- a/src/update_engine/omaha_response_handler_action_unittest.cc
+++ b/src/update_engine/omaha_response_handler_action_unittest.cc
@@ -88,7 +88,6 @@ TEST_F(OmahaResponseHandlerActionTest, SimpleTest) {
     in.hash = "HASH+";
     in.size = 12;
     in.needs_admin = true;
-    in.prompt = false;
     InstallPlan install_plan;
     EXPECT_TRUE(DoTest(in, "/dev/sda3", &install_plan));
     EXPECT_EQ(in.payload_urls[0], install_plan.download_url);
@@ -104,7 +103,6 @@ TEST_F(OmahaResponseHandlerActionTest, SimpleTest) {
     in.hash = "HASHj+";
     in.size = 12;
     in.needs_admin = true;
-    in.prompt = true;
     InstallPlan install_plan;
     EXPECT_TRUE(DoTest(in, "/dev/sda4", &install_plan));
     EXPECT_EQ(in.payload_urls[0], install_plan.download_url);
@@ -120,7 +118,6 @@ TEST_F(OmahaResponseHandlerActionTest, SimpleTest) {
     in.hash = "HASHj+";
     in.size = 12;
     in.needs_admin = true;
-    in.prompt = true;
     InstallPlan install_plan;
     EXPECT_TRUE(DoTest(in, "/dev/sda3", &install_plan));
     EXPECT_EQ(in.payload_urls[0], install_plan.download_url);