diff --git a/sysmoOCTSIM/atmel_start_config.atstart b/sysmoOCTSIM/atmel_start_config.atstart
index f3620ee..385c890 100644
--- a/sysmoOCTSIM/atmel_start_config.atstart
+++ b/sysmoOCTSIM/atmel_start_config.atstart
@@ -787,8 +787,8 @@
       enable_xosc32k: true
       osculp32k_calib: 0
       osculp32k_calib_enable: false
-      rtc_1khz_selection: true
-      rtc_source_oscillator: 32kHz Ultra Low Power Internal Oscillator (OSCULP32K)
+      rtc_1khz_selection: false
+      rtc_source_oscillator: 32kHz External Crystal Oscillator (XOSC32K)
       xosc32k_arch_cfden: false
       xosc32k_arch_cfdeo: false
       xosc32k_arch_cgm: Standard mode
diff --git a/sysmoOCTSIM/config/hpl_osc32kctrl_config.h b/sysmoOCTSIM/config/hpl_osc32kctrl_config.h
index d0b0d34..943dfea 100644
--- a/sysmoOCTSIM/config/hpl_osc32kctrl_config.h
+++ b/sysmoOCTSIM/config/hpl_osc32kctrl_config.h
@@ -17,14 +17,14 @@
 // <i> This defines the clock source for RTC
 // <id> rtc_source_oscillator
 #ifndef CONF_RTCCTRL_SRC
-#define CONF_RTCCTRL_SRC GCLK_GENCTRL_SRC_OSCULP32K
+#define CONF_RTCCTRL_SRC GCLK_GENCTRL_SRC_XOSC32K
 #endif
 
 // <q> Use 1 kHz output
 // <id> rtc_1khz_selection
 #ifndef CONF_RTCCTRL_1KHZ
 
-#define CONF_RTCCTRL_1KHZ 1
+#define CONF_RTCCTRL_1KHZ 0
 
 #endif