diff --git a/Lib/csv.py b/Lib/csv.py
index dc85077f3e..f2ee0e1693 100644
--- a/Lib/csv.py
+++ b/Lib/csv.py
@@ -410,7 +410,7 @@ def has_header(self, sample):
 
             for col in list(columnTypes.keys()):
 
-                for thisType in [int, float, complex]:
+                for thisType in [complex, float, int]:
                     try:
                         thisType(row[col])
                         break
diff --git a/Lib/test/test_csv.py b/Lib/test/test_csv.py
index a98707ce3c..f5f8cd87fb 100644
--- a/Lib/test/test_csv.py
+++ b/Lib/test/test_csv.py
@@ -1238,5 +1238,14 @@ def test__all__(self):
         support.check__all__(self, csv, ('csv', '_csv'), extra=extra)
 
 
+class TestSniffer(unittest.TestCase):
+    mixed = '''"time","forces"
+0,0
+0.5,0.9
+'''
+    def test_issue43625(self):
+        sniffer = csv.Sniffer()
+        self.assertTrue(sniffer.has_header(self.mixed))
+
 if __name__ == '__main__':
     unittest.main()