diff --git a/dlls/ucrtbase/tests/printf.c b/dlls/ucrtbase/tests/printf.c
index 7647ac57e25..64ccd4ca5df 100644
--- a/dlls/ucrtbase/tests/printf.c
+++ b/dlls/ucrtbase/tests/printf.c
@@ -648,6 +648,67 @@ static void test_printf_natural_string(void)
     ok(!lstrcmpW(wbuffer, wide_out), "buffer wrong, got=%s\n", wine_dbgstr_w(wbuffer));
 }
 
+static void test_printf_fp(void)
+{
+    static const int flags[] = {
+        0,
+        _CRT_INTERNAL_PRINTF_LEGACY_MSVCRT_COMPATIBILITY,
+        _CRT_INTERNAL_PRINTF_LEGACY_THREE_DIGIT_EXPONENTS,
+        _CRT_INTERNAL_PRINTF_LEGACY_MSVCRT_COMPATIBILITY
+            | _CRT_INTERNAL_PRINTF_LEGACY_THREE_DIGIT_EXPONENTS
+    };
+    static const struct {
+        const char *fmt;
+        double d;
+        const char *res[ARRAY_SIZE(flags)];
+    } tests[] = {
+        { "%a", 0, { "0x0.0000000000000p+0" }},
+        { "%A", 0, { "0X0.0000000000000P+0" }},
+        { "%a", 0.5, { "0x1.0000000000000p-1" }},
+        { "%a", 1, { "0x1.0000000000000p+0" }},
+        { "%a", 20, { "0x1.4000000000000p+4" }},
+        { "%a", -1, { "-0x1.0000000000000p+0" }},
+        { "%a", 0.1, { "0x1.999999999999ap-4" }},
+        { "%24a", 0.1, { "    0x1.999999999999ap-4" }},
+        { "%024a", 0.1, { "0x00001.999999999999ap-4" }},
+        { "%.2a", 0.1, { "0x1.9ap-4" }},
+        { "%.20a", 0.1, { "0x1.999999999999a0000000p-4" }},
+        { "%.a", 0.1e-20, { "0x1p-70" }},
+        { "%a", 0.1e-20, { "0x1.2e3b40a0e9b4fp-70" }},
+        { "%a", 4.9406564584124654e-324, { "0x0.0000000000001p-1022" }},
+        { "%.0a", -1.5, { "-0x1p+0" }},
+        { "%.0a", -0.5, { "-0x1p-1" }},
+        { "%.0a", 0.5, { "0x1p-1" }},
+        { "%.0a", 1.5, { "0x1p+0" }},
+        { "%.0a", 1.99, { "0x2p+0" }},
+        { "%.0a", 2, { "0x1p+1" }},
+        { "%.0a", 9.5, { "0x1p+3" }},
+        { "%.0a", 10.5, { "0x1p+3" }},
+        { "%#.0a", -1.5, { "-0x1.p+0" }},
+        { "%#.0a", -0.5, { "-0x1.p-1" }},
+        { "%#.0a", 0.5, { "0x1.p-1" }},
+        { "%#.0a", 1.5, { "0x1.p+0" }},
+    };
+
+    const char *res = NULL;
+    char buf[100];
+    int i, j, r;
+
+    for (i = 0; i < ARRAY_SIZE(tests); i++)
+    {
+        for (j = 0; j < ARRAY_SIZE(flags); j++)
+        {
+            if (tests[i].res[j]) res = tests[i].res[j];
+
+            r = vsprintf_wrapper(flags[j], buf, sizeof(buf), tests[i].fmt, tests[i].d);
+            ok(r == strlen(res), "%d,%d) r = %d, expected %d\n",
+                    i, j, r, strlen(res));
+            ok(!strcmp(buf, res), "%d,%d) buf = %s, expected %s\n",
+                    i, j, buf, res);
+        }
+    }
+}
+
 START_TEST(printf)
 {
     ok(_set_invalid_parameter_handler(test_invalid_parameter_handler) == NULL,
@@ -664,4 +725,5 @@ START_TEST(printf)
     test_printf_legacy_three_digit_exp();
     test_printf_c99();
     test_printf_natural_string();
+    test_printf_fp();
 }