diff --git a/gui/builtinGraphs/fitCap.py b/gui/builtinGraphs/fitCap.py
index 7e9dc8c58..5f6420f7e 100644
--- a/gui/builtinGraphs/fitCap.py
+++ b/gui/builtinGraphs/fitCap.py
@@ -44,7 +44,7 @@ class FitCapAmountVsTimeGraph(FitGraph):
     @property
     def inputs(self):
         return [
-            Input(handle='time', unit='s', label='Time', iconID=1392, defaultValue=120, defaultRange=(0, 300), mainOnly=False),
+            Input(handle='time', unit='s', label='Time', iconID=1392, defaultValue=120, defaultRange=(0, 300), mainOnly=True),
             Input(handle='capAmount', unit='%', label='Cap amount', iconID=1668, defaultValue=25, defaultRange=(0, 100), mainOnly=True)]
 
     # Calculation stuff