diff --git a/test/unit/lib/thread/thread.c/thread_ut.c b/test/unit/lib/thread/thread.c/thread_ut.c
index caebe348d..c53302e83 100644
--- a/test/unit/lib/thread/thread.c/thread_ut.c
+++ b/test/unit/lib/thread/thread.c/thread_ut.c
@@ -280,6 +280,7 @@ unreg_ch_done(struct spdk_io_channel_iter *i)
 
 	ctx->ch_done = true;
 
+	SPDK_CU_ASSERT_FATAL(i->cur_thread != NULL);
 	spdk_for_each_channel_continue(i, 0);
 }
 
diff --git a/test/unit/lib/util/base64.c/base64_ut.c b/test/unit/lib/util/base64.c/base64_ut.c
index 0f537132a..652a1e94c 100644
--- a/test/unit/lib/util/base64.c/base64_ut.c
+++ b/test/unit/lib/util/base64.c/base64_ut.c
@@ -192,7 +192,7 @@ test_base64_urlsafe_decode(void)
 {
 	char raw_buf[100];
 	void *raw = (void *)raw_buf;
-	size_t raw_len;
+	size_t raw_len = 0;
 	int ret;
 
 	ret = spdk_base64_urlsafe_decode(raw, &raw_len, text_A);
diff --git a/test/unit/lib/util/string.c/string_ut.c b/test/unit/lib/util/string.c/string_ut.c
index 104893879..2ca32cbe4 100644
--- a/test/unit/lib/util/string.c/string_ut.c
+++ b/test/unit/lib/util/string.c/string_ut.c
@@ -142,7 +142,7 @@ test_parse_capacity(void)
 	char str[128];
 	uint64_t cap;
 	int rc;
-	bool has_prefix;
+	bool has_prefix = true;
 
 	rc = spdk_parse_capacity("472", &cap, &has_prefix);
 	CU_ASSERT(rc == 0);