diff --git a/include/fmt/format.h b/include/fmt/format.h
index 82ddb407d098..08ee57d970c0 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -579,9 +579,10 @@ inline auto code_point_index(basic_string_view<char8_type> s, size_t n)
   return s.size();
 }
 
-template <typename T>
-using is_fast_float = bool_constant<std::numeric_limits<T>::is_iec559 &&
-                                    sizeof(T) <= sizeof(double)>;
+template <typename T, bool = std::is_floating_point<T>::value>
+struct is_fast_float : bool_constant<std::numeric_limits<T>::is_iec559 &&
+                                     sizeof(T) <= sizeof(double)> {};
+template <typename T> struct is_fast_float<T, false> : std::false_type {};
 
 #ifndef FMT_USE_FULL_CACHE_DRAGONBOX
 #  define FMT_USE_FULL_CACHE_DRAGONBOX 0
diff --git a/test/ostream-test.cc b/test/ostream-test.cc
index 62db0f53f768..b0dd3c4b26dd 100644
--- a/test/ostream-test.cc
+++ b/test/ostream-test.cc
@@ -23,6 +23,7 @@ template <> struct formatter<test> : formatter<int> {
 
 #include <sstream>
 
+#include "fmt/compile.h"
 #include "fmt/ostream.h"
 #include "fmt/ranges.h"
 #include "gmock/gmock.h"
@@ -280,3 +281,15 @@ TEST(ostream_test, range) {
   auto strs = std::vector<test_string>{test_string("foo"), test_string("bar")};
   EXPECT_EQ("[foo, bar]", fmt::format("{}", strs));
 }
+
+struct abstract {
+  virtual ~abstract() = default;
+  virtual void f() = 0;
+  friend std::ostream& operator<<(std::ostream& os, const abstract&) {
+    return os;
+  }
+};
+
+void format_abstract_compiles(const abstract& a) {
+  fmt::format(FMT_COMPILE("{}"), a);
+}