diff --git a/examples/nanocoap_server/Makefile.ci b/examples/nanocoap_server/Makefile.ci
index 40a91864e4..d15d582608 100644
--- a/examples/nanocoap_server/Makefile.ci
+++ b/examples/nanocoap_server/Makefile.ci
@@ -9,6 +9,7 @@ BOARD_INSUFFICIENT_MEMORY := \
     i-nucleo-lrwan1 \
     msb-430 \
     msb-430h \
+    microduino-corerf \
     nucleo-f030r8 \
     nucleo-f031k6 \
     nucleo-f042k6 \
diff --git a/tests/pkg_microcoap/Makefile.ci b/tests/pkg_microcoap/Makefile.ci
index b4330707ca..29a2104b1c 100644
--- a/tests/pkg_microcoap/Makefile.ci
+++ b/tests/pkg_microcoap/Makefile.ci
@@ -9,6 +9,7 @@ BOARD_INSUFFICIENT_MEMORY := \
     i-nucleo-lrwan1 \
     msb-430 \
     msb-430h \
+    microduino-corerf \
     nucleo-f030r8 \
     nucleo-f031k6 \
     nucleo-f042k6 \
diff --git a/tests/sntp/Makefile.ci b/tests/sntp/Makefile.ci
index 981a790ea3..ecd1a4ed71 100644
--- a/tests/sntp/Makefile.ci
+++ b/tests/sntp/Makefile.ci
@@ -16,6 +16,7 @@ BOARD_INSUFFICIENT_MEMORY := \
     nucleo-f334r8 \
     nucleo-l031k6 \
     nucleo-l053r8 \
+    microduino-corerf \
     stm32f030f4-demo \
     stm32f0discovery \
     stm32l0538-disco \