diff --git a/debian/changelog b/debian/changelog
index dca3b0ab0..caa1ee87f 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -43,6 +43,7 @@ linux-2.6 (2.6.26~rc6-1~experimental.1) UNRELEASED; urgency=low
     Kconfig variable patch by Robert Millan (closes: #485063).
   * Add request_firmware patch for ip2.
   * Add request_firmware patch for acenic. (closes: #284221)
+  * [x86, ia64]: Set HPET_RTC_IRQ. (closes: #479709)
 
   [ Martin Michlmayr ]
   * [arm/orion5x] Update the config to reflect upstream renaming this
diff --git a/debian/config/amd64/config b/debian/config/amd64/config
index 8115ab0a1..007eb760f 100644
--- a/debian/config/amd64/config
+++ b/debian/config/amd64/config
@@ -249,7 +249,7 @@ CONFIG_MWAVE=m
 CONFIG_RAW_DRIVER=m
 CONFIG_MAX_RAW_DEVS=256
 CONFIG_HPET=y
-# CONFIG_HPET_RTC_IRQ is not set
+CONFIG_HPET_RTC_IRQ=y
 CONFIG_HPET_MMAP=y
 CONFIG_HANGCHECK_TIMER=m
 
diff --git a/debian/config/i386/config b/debian/config/i386/config
index c3f93bb9f..7ddb7ac55 100644
--- a/debian/config/i386/config
+++ b/debian/config/i386/config
@@ -335,7 +335,7 @@ CONFIG_CS5535_GPIO=m
 CONFIG_RAW_DRIVER=m
 CONFIG_MAX_RAW_DEVS=256
 CONFIG_HPET=y
-# CONFIG_HPET_RTC_IRQ is not set
+CONFIG_HPET_RTC_IRQ=y
 CONFIG_HPET_MMAP=y
 CONFIG_HANGCHECK_TIMER=m
 
diff --git a/debian/config/ia64/config b/debian/config/ia64/config
index 5d45dcc8a..3e14a04f2 100644
--- a/debian/config/ia64/config
+++ b/debian/config/ia64/config
@@ -98,7 +98,7 @@ CONFIG_APPLICOM=m
 CONFIG_RAW_DRIVER=m
 CONFIG_MAX_RAW_DEVS=256
 CONFIG_HPET=y
-# CONFIG_HPET_RTC_IRQ is not set
+CONFIG_HPET_RTC_IRQ=y
 # CONFIG_HPET_MMAP is not set
 CONFIG_HANGCHECK_TIMER=m
 CONFIG_MMTIMER=m