diff --git a/rowers/models.py b/rowers/models.py
index 6846f06f..906c959e 100644
--- a/rowers/models.py
+++ b/rowers/models.py
@@ -2392,12 +2392,12 @@ class Workout(models.Model):
     csvfilename = models.CharField(blank=True,max_length=150)
     uploadedtoc2 = models.IntegerField(default=0)
     averagehr = models.IntegerField(blank=True,null=True)
-    maxhr = models.IntegerField(blank=True,null=True)
-    uploadedtostrava = models.IntegerField(default=0)
-    uploadedtosporttracks = models.IntegerField(default=0)
-    uploadedtounderarmour = models.IntegerField(default=0)
-    uploadedtotp = models.IntegerField(default=0)
-    uploadedtorunkeeper = models.IntegerField(default=0)
+    maxhr = models.BigIntegerField(blank=True,null=True)
+    uploadedtostrava = models.BigIntegerField(default=0)
+    uploadedtosporttracks = models.BigIntegerField(default=0)
+    uploadedtounderarmour = models.BigIntegerField(default=0)
+    uploadedtotp = models.BigIntegerField(default=0)
+    uploadedtorunkeeper = models.BigIntegerField(default=0)
     forceunit = models.CharField(default='lbs',
                                  choices = (
                                      ('lbs','lbs'),