diff --git a/adafruit_bitmap_font/bitmap_font.py b/adafruit_bitmap_font/bitmap_font.py
index 5ceee18..c7c1e15 100644
--- a/adafruit_bitmap_font/bitmap_font.py
+++ b/adafruit_bitmap_font/bitmap_font.py
@@ -33,19 +33,19 @@ def load_font(filename, bitmap=None):
         import displayio
 
         bitmap = displayio.Bitmap
-    font_file = open(filename, "rb")
-    first_four = font_file.read(4)
-    if filename.endswith("bdf") and first_four == b"STAR":
-        from . import bdf
+    with open(filename, "rb") as font_file:
+        first_four = font_file.read(4)
+        if filename.endswith("bdf") and first_four == b"STAR":
+            from . import bdf
 
-        return bdf.BDF(font_file, bitmap)
-    if filename.endswith("pcf") and first_four == b"\x01fcp":
-        from . import pcf
+            return bdf.BDF(font_file, bitmap)
+        if filename.endswith("pcf") and first_four == b"\x01fcp":
+            from . import pcf
 
-        return pcf.PCF(font_file, bitmap)
-    if filename.endswith("ttf") and first_four == b"\x00\x01\x00\x00":
-        from . import ttf
+            return pcf.PCF(font_file, bitmap)
+        if filename.endswith("ttf") and first_four == b"\x00\x01\x00\x00":
+            from . import ttf
 
-        return ttf.TTF(font_file, bitmap)
+            return ttf.TTF(font_file, bitmap)
 
     raise ValueError("Unknown magic number %r" % first_four)