diff --git a/qcodes/instrument_drivers/rohde_schwarz/SGS100A.py b/qcodes/instrument_drivers/rohde_schwarz/SGS100A.py
index f27c1bdeca3..f6f758675f7 100644
--- a/qcodes/instrument_drivers/rohde_schwarz/SGS100A.py
+++ b/qcodes/instrument_drivers/rohde_schwarz/SGS100A.py
@@ -29,7 +29,7 @@ def __init__(self, name, address, **kwargs):
                            get_cmd='SOUR:FREQ' + '?',
                            set_cmd='SOUR:FREQ' + ' {:.2f}',
                            get_parser=float,
-                           vals=vals.Numbers(1e9, 20e9))
+                           vals=vals.Numbers(1e6, 20e9))
         self.add_parameter(name='phase',
                            label='Phase',
                            units='deg',