diff --git a/pkg/semtech-loramac/Makefile.dep b/pkg/semtech-loramac/Makefile.dep
index bce0c7875d..7bc149afcf 100644
--- a/pkg/semtech-loramac/Makefile.dep
+++ b/pkg/semtech-loramac/Makefile.dep
@@ -9,7 +9,6 @@ USEMODULE += semtech_loramac_crypto
 USEMODULE += semtech_loramac_arch
 
 USEMODULE += ztimer_msec
-USEMODULE += ztimer_periph_rtt
 
 # The build fails on MSP430 because the toolchain doesn't provide
 # EXIT_SUCCESS/EXIT_FAILURE macros
diff --git a/tests/pkg_semtech-loramac/Makefile.ci b/tests/pkg_semtech-loramac/Makefile.ci
index d79a66f7ce..eef0cd323f 100644
--- a/tests/pkg_semtech-loramac/Makefile.ci
+++ b/tests/pkg_semtech-loramac/Makefile.ci
@@ -5,6 +5,7 @@ BOARD_INSUFFICIENT_MEMORY := \
     arduino-uno \
     atmega328p \
     atmega328p-xplained-mini \
+    atxmega-a1u-xpro \
     nucleo-f031k6 \
     nucleo-f042k6 \
     nucleo-l011k4 \