diff --git a/examples/gnrc_networking/Makefile.ci b/examples/gnrc_networking/Makefile.ci
index 162bb3edd0..ed67dce176 100644
--- a/examples/gnrc_networking/Makefile.ci
+++ b/examples/gnrc_networking/Makefile.ci
@@ -11,23 +11,15 @@ BOARD_INSUFFICIENT_MEMORY := \
     blackpill \
     bluepill \
     bluepill-stm32f030c8 \
-    calliope-mini \
     derfmega128 \
-    hifive1 \
-    hifive1b \
     i-nucleo-lrwan1 \
-    im880b \
     mega-xplained \
-    microbit \
     microduino-corerf \
     msb-430 \
     msb-430h \
     nucleo-f030r8 \
     nucleo-f031k6 \
     nucleo-f042k6 \
-    nucleo-f070rb \
-    nucleo-f072rb \
-    nucleo-f103rb \
     nucleo-f302r8 \
     nucleo-f303k8 \
     nucleo-f334r8 \
@@ -38,7 +30,6 @@ BOARD_INSUFFICIENT_MEMORY := \
     saml10-xpro \
     saml11-xpro \
     slstk3400a \
-    spark-core \
     stk3200 \
     stm32f030f4-demo \
     stm32f0discovery \
diff --git a/sys/include/net/gnrc/udp.h b/sys/include/net/gnrc/udp.h
index 37528d87e8..b3f59ee8e4 100644
--- a/sys/include/net/gnrc/udp.h
+++ b/sys/include/net/gnrc/udp.h
@@ -59,7 +59,7 @@ extern "C" {
  * @brief   Default stack size to use for the UDP thread
  */
 #ifndef GNRC_UDP_STACK_SIZE
-#define GNRC_UDP_STACK_SIZE     (THREAD_STACKSIZE_DEFAULT)
+#define GNRC_UDP_STACK_SIZE     (THREAD_STACKSIZE_SMALL)
 #endif
 /** @} */