diff --git a/src/humanize/filesize.py b/src/humanize/filesize.py
index bdadd55..5650d02 100644
--- a/src/humanize/filesize.py
+++ b/src/humanize/filesize.py
@@ -94,7 +94,7 @@ def naturalsize(
         return f"{bytes_} Byte"
 
     if abs_bytes < base:
-        return f"{bytes_}B" if gnu else f"{bytes_} Bytes"
+        return f"{int(bytes_)}B" if gnu else f"{int(bytes_)} Bytes"
 
     for i, s in enumerate(suffix, 2):
         unit = base**i
diff --git a/tests/test_filesize.py b/tests/test_filesize.py
index fbb662a..cf4a002 100644
--- a/tests/test_filesize.py
+++ b/tests/test_filesize.py
@@ -73,6 +73,12 @@
         ([3000, False, True, "%.3f"], "2.930K"),
         ([3000000000, False, True, "%.0f"], "3G"),
         ([10**26 * 30, True, False, "%.3f"], "2.423 RiB"),
+        ([1.123456789], "1 Bytes"),
+        ([1.123456789 * 10**3], "1.1 kB"),
+        ([1.123456789 * 10**6], "1.1 MB"),
+        ([1.123456789, False, True], "1B"),
+        ([1.123456789 * 10**3, False, True], "1.1K"),
+        ([1.123456789 * 10**6, False, True], "1.1M"),
     ],
 )
 def test_naturalsize(test_args: list[int] | list[int | bool], expected: str) -> None: