diff --git a/sys/ztimer/convert.c b/sys/ztimer/convert.c
index 19232f4016..921a478155 100644
--- a/sys/ztimer/convert.c
+++ b/sys/ztimer/convert.c
@@ -46,6 +46,9 @@ void ztimer_convert_init(ztimer_convert_t *ztimer_convert,
             .arg = ztimer_convert,
         },
         .super.max_value = max_value,
+#  ifdef MODULE_PM_LAYERED
+        .super.block_pm_mode = ZTIMER_CLOCK_NO_REQUIRED_PM_MODE,
+#  endif
     };
 
     *ztimer_convert = tmp;
diff --git a/sys/ztimer/convert_frac.c b/sys/ztimer/convert_frac.c
index c614b3c6a0..0d3dc66ecd 100644
--- a/sys/ztimer/convert_frac.c
+++ b/sys/ztimer/convert_frac.c
@@ -111,4 +111,7 @@ void ztimer_convert_frac_init(ztimer_convert_frac_t *self,
         self->round = freq_self / freq_lower;
         self->super.super.max_value = UINT32_MAX;
     }
+#ifdef MODULE_PM_LAYERED
+    self->super.super.block_pm_mode = ZTIMER_CLOCK_NO_REQUIRED_PM_MODE;
+#endif
 }