diff --git a/broadcastradio/1.1/utils/Utils.cpp b/broadcastradio/1.1/utils/Utils.cpp
index 9dc0a53..270aabb 100644
--- a/broadcastradio/1.1/utils/Utils.cpp
+++ b/broadcastradio/1.1/utils/Utils.cpp
@@ -24,7 +24,6 @@
 namespace hardware {
 namespace broadcastradio {
 namespace V1_1 {
-namespace implementation {
 namespace utils {
 
 using V1_0::Band;
@@ -166,26 +165,31 @@
     sel.primaryId.type = static_cast<uint32_t>(IdentifierType::AMFM_FREQUENCY);
     sel.primaryId.value = channel;
     if (subChannel > 0) {
-        // stating sub channel for AM/FM channel does not give any guarantees,
-        // but we can't do much more without HD station ID
+        /* stating sub channel for AM/FM channel does not give any guarantees,
+         * but we can't do much more without HD station ID
+         *
+         * The legacy APIs had 1-based subChannels, while ProgramSelector is 0-based.
+         */
         sel.secondaryIds = hidl_vec<ProgramIdentifier>{
-            {static_cast<uint32_t>(IdentifierType::HD_SUBCHANNEL), subChannel},
+            {static_cast<uint32_t>(IdentifierType::HD_SUBCHANNEL), subChannel - 1},
         };
     }
 
     return sel;
 }
 
-bool getLegacyChannel(const ProgramSelector& sel, uint32_t& channelOut, uint32_t& subChannelOut) {
+bool getLegacyChannel(const ProgramSelector& sel, uint32_t* channelOut, uint32_t* subChannelOut) {
+    if (channelOut) *channelOut = 0;
+    if (subChannelOut) *subChannelOut = 0;
     if (isAmFm(getType(sel))) {
-        channelOut = getId(sel, IdentifierType::AMFM_FREQUENCY);
-        subChannelOut = getId(sel, IdentifierType::HD_SUBCHANNEL, 0);
+        if (channelOut) *channelOut = getId(sel, IdentifierType::AMFM_FREQUENCY);
+        if (subChannelOut && hasId(sel, IdentifierType::HD_SUBCHANNEL)) {
+            // The legacy APIs had 1-based subChannels, while ProgramSelector is 0-based.
+            *subChannelOut = getId(sel, IdentifierType::HD_SUBCHANNEL) + 1;
+        }
         return true;
-    } else {
-        channelOut = 0;
-        subChannelOut = 0;
-        return false;
     }
+    return false;
 }
 
 bool isDigital(const ProgramSelector& sel) {
@@ -200,7 +204,6 @@
 }
 
 }  // namespace utils
-}  // namespace implementation
 }  // namespace V1_1
 }  // namespace broadcastradio
 }  // namespace hardware