diff --git a/tests/libtest/lib552.c b/tests/libtest/lib552.c
index c1266c763..3a93dafaf 100644
--- a/tests/libtest/lib552.c
+++ b/tests/libtest/lib552.c
@@ -92,6 +92,7 @@ int my_trace(CURL *handle, curl_infotype type,
   switch(type) {
   case CURLINFO_TEXT:
     fprintf(stderr, "== Info: %s", (char *)data);
+    /* FALLTHROUGH */
   default: /* in case a new one is introduced to shock us */
     return 0;
 
diff --git a/tests/libtest/testtrace.c b/tests/libtest/testtrace.c
index 5eeeeb65d..62641e15c 100644
--- a/tests/libtest/testtrace.c
+++ b/tests/libtest/testtrace.c
@@ -113,6 +113,7 @@ int libtest_debug_cb(CURL *handle, curl_infotype type,
   switch(type) {
   case CURLINFO_TEXT:
     fprintf(stderr, "%s== Info: %s", timestr, (char *)data);
+    /* FALLTHROUGH */
   default: /* in case a new one is introduced to shock us */
     return 0;