diff --git a/tests/unittests/Makefile.ci b/tests/unittests/Makefile.ci
index f148d5c04f..8cc7c91299 100644
--- a/tests/unittests/Makefile.ci
+++ b/tests/unittests/Makefile.ci
@@ -84,6 +84,7 @@ BOARD_INSUFFICIENT_MEMORY := \
     slstk3401a \
     sltb001a \
     slwstk6000b-slwrb4150a \
+    slwstk6220a \
     sodaq-autonomo \
     sodaq-explorer \
     sodaq-one \