diff --git a/tests/pkg_tinydtls_sock_async/Makefile b/tests/pkg_tinydtls_sock_async/Makefile
index fb057a9a9b..524da27b84 100644
--- a/tests/pkg_tinydtls_sock_async/Makefile
+++ b/tests/pkg_tinydtls_sock_async/Makefile
@@ -43,5 +43,6 @@ CFLAGS += -DDTLS_DEFAULT_PORT=$(DTLS_PORT)
 
 # FIXME: This is a temporary patch
 CFLAGS += -DTHREAD_STACKSIZE_MAIN=\(2*THREAD_STACKSIZE_LARGE\)
+CFLAGS += -DEVENT_THREAD_MEDIUM_STACKSIZE=\(2*THREAD_STACKSIZE_LARGE\)
 
 include $(RIOTBASE)/Makefile.include