diff --git a/Tests/LibC/TestScanf.cpp b/Tests/LibC/TestScanf.cpp
index dee99b6611..4291276a4d 100644
--- a/Tests/LibC/TestScanf.cpp
+++ b/Tests/LibC/TestScanf.cpp
@@ -153,6 +153,9 @@ const TestSuite test_suites[] {
     { "%x", "0x519", 1, 1, { unsignedarg0 }, { to_value_t(0x519) } },
     { "%x", "0x51g", 1, 1, { unsignedarg0 }, { to_value_t(0x51u) } },
     { "%06x", "0xabcdef", 1, 1, { unsignedarg0 }, { to_value_t(0xabcdefu) } },
+    { "%X", "0xCAFEBABE", 1, 1, { unsignedarg0 }, { to_value_t(0xcafebabe) } },
+    { "%04X", "0x5E4E", 1, 1, { unsignedarg0 }, { to_value_t(0x5e4e) } },
+    { "%X", "0x51Eg", 1, 1, { unsignedarg0 }, { to_value_t(0x51e) } },
     { "\"%%%d#", "\"%42#", 1, 1, { intarg0 }, { to_value_t(42) } },
     { "  %d", "42", 1, 1, { intarg0 }, { to_value_t(42) } },
     { "%d", "  42", 1, 1, { intarg0 }, { to_value_t(42) } },
diff --git a/Userland/Libraries/LibC/scanf.cpp b/Userland/Libraries/LibC/scanf.cpp
index d66043aa10..f760922de3 100644
--- a/Userland/Libraries/LibC/scanf.cpp
+++ b/Userland/Libraries/LibC/scanf.cpp
@@ -488,6 +488,7 @@ extern "C" int vsscanf(const char* input, const char* format, va_list ap)
                 conversion_specifier = ConversionSpecifier::Unsigned;
                 break;
             case 'x':
+            case 'X':
                 format_lexer.consume();
                 conversion_specifier = ConversionSpecifier::Hex;
                 break;