diff --git a/misc/scripts/png2c.py b/misc/scripts/png2c.py
index f028201771..29d7252bad 100755
--- a/misc/scripts/png2c.py
+++ b/misc/scripts/png2c.py
@@ -23,7 +23,7 @@ if len(sys.argv) < 2:
 r = re.compile("^([a-zA-Z._][a-zA-Z._0-9]*)[.][pP][nN][gG]$")
 
 for path in sys.argv[1:]:
-        filename = os.path.basename(path)
+        filename = os.path.basename(path).replace('-','_')
         m = r.match(filename)
         # Allow only filenames that make sense
         # as C variable names