diff --git a/include/seqan3/core/debug_stream/debug_stream_type.hpp b/include/seqan3/core/debug_stream/debug_stream_type.hpp
index 36c88e5756..df18d88f1f 100644
--- a/include/seqan3/core/debug_stream/debug_stream_type.hpp
+++ b/include/seqan3/core/debug_stream/debug_stream_type.hpp
@@ -185,12 +185,17 @@ class debug_stream_type
         stream->unsetf(flag);
     }
 
+// fmtflags are an enum in libstc++ and unsigned in libc++
+#ifdef _LIBCPP_VERSION
+    static_assert(std::same_as<fmtflags, unsigned>);
+#else
     //!\copybrief setf()
     debug_stream_type & operator<<(fmtflags const flag)
     {
         setf(flag);
         return *this;
     }
+#endif
     //!\}
 
     /*!\name Format flags (seqan3::fmtflags2)
diff --git a/test/unit/core/debug_stream_test.cpp b/test/unit/core/debug_stream_test.cpp
index 33b4693bb5..902e7d97cd 100644
--- a/test/unit/core/debug_stream_test.cpp
+++ b/test/unit/core/debug_stream_test.cpp
@@ -286,3 +286,14 @@ TEST(debug_stream_test, byte)
     o.flush();
     EXPECT_EQ(o.str(), "40,244");
 }
+
+TEST(debug_stream_test, integers)
+{
+    std::ostringstream o{};
+    seqan3::debug_stream_type my_stream{o};
+
+    my_stream << uint8_t{1} << ',' << uint16_t{2} << ',' << uint32_t{3} << ',' << uint64_t{4} << ',' << size_t{5} << ','
+              << int8_t{6} << ',' << int16_t{7} << ',' << int32_t{8} << ',' << int64_t{9};
+    o.flush();
+    EXPECT_EQ(o.str(), "1,2,3,4,5,6,7,8,9");
+}