diff --git a/examples/riot/blinky/Makefile b/examples/riot/blinky/Makefile
index 6135bfb6..f22fa02d 100755
--- a/examples/riot/blinky/Makefile
+++ b/examples/riot/blinky/Makefile
@@ -13,6 +13,8 @@ DEVELHELP ?= 1
 QUIET ?= 1
 
 # Enable reactor-uc features
-CFLAGS += -DNETWORK_CHANNEL_TCP_POSIX
+# CFLAGS += -DNETWORK_CHANNEL_TCP_POSIX
+CFLAGS += -DEVENT_QUEUE_SIZE=32
+CFLAGS += -DREACTION_QUEUE_SIZE=32
 
 include $(CURDIR)/../../../make/riot/riot.mk
diff --git a/examples/riot/hello/Makefile b/examples/riot/hello/Makefile
index a566a09f..f22fa02d 100755
--- a/examples/riot/hello/Makefile
+++ b/examples/riot/hello/Makefile
@@ -14,5 +14,7 @@ QUIET ?= 1
 
 # Enable reactor-uc features
 # CFLAGS += -DNETWORK_CHANNEL_TCP_POSIX
+CFLAGS += -DEVENT_QUEUE_SIZE=32
+CFLAGS += -DREACTION_QUEUE_SIZE=32
 
 include $(CURDIR)/../../../make/riot/riot.mk