diff --git a/Tests/AK/TestString.cpp b/Tests/AK/TestString.cpp
index 2c1420c7a9..0e398edee7 100644
--- a/Tests/AK/TestString.cpp
+++ b/Tests/AK/TestString.cpp
@@ -257,20 +257,6 @@ TEST_CASE(builder_zero_initial_capacity)
     EXPECT_EQ(built.length(), 0u);
 }
 
-TEST_CASE(sprintf)
-{
-    char buf1[128];
-    int ret1 = sprintf(buf1, "%+d", 12);
-    EXPECT_EQ(ret1, 3);
-
-    char buf2[128];
-    int ret2 = sprintf(buf2, "%+d", -12);
-    EXPECT_EQ(ret2, 3);
-
-    EXPECT_EQ(String(buf1), String("+12"));
-    EXPECT_EQ(String(buf2), String("-12"));
-}
-
 TEST_CASE(find)
 {
     String a = "foobarbar";
diff --git a/Tests/LibC/TestStdio.cpp b/Tests/LibC/TestStdio.cpp
index 0c0b818d0e..b23176b8e6 100644
--- a/Tests/LibC/TestStdio.cpp
+++ b/Tests/LibC/TestStdio.cpp
@@ -40,3 +40,17 @@ TEST_CASE(flush_on_exit)
         EXPECT_EQ(strcmp(test_str, buf), 0);
     }
 }
+
+TEST_CASE(sprintf_sign)
+{
+    char buf1[128];
+    int ret1 = sprintf(buf1, "%+d", 12);
+    EXPECT_EQ(ret1, 3);
+
+    char buf2[128];
+    int ret2 = sprintf(buf2, "%+d", -12);
+    EXPECT_EQ(ret2, 3);
+
+    EXPECT_EQ(buf1, "+12"sv);
+    EXPECT_EQ(buf2, "-12"sv);
+}