diff --git a/compiler/characterizer/delay.py b/compiler/characterizer/delay.py
index 867b3cdb..5d2dd09a 100644
--- a/compiler/characterizer/delay.py
+++ b/compiler/characterizer/delay.py
@@ -1362,8 +1362,9 @@ class delay(simulation):
                         else:
                             debug.error("Measurement name not recognized: {}".format(mname), 1)
 
-        # Estimate the period as double the delay with margin
-        period_margin = 0.1
+        # Margin for error in period. Calculated by averaging required margin for a small and large 
+        # memory. FIXME: margin is quite large, should be looked into.
+        period_margin = 1.85
         sram_data = {"min_period": (max_delay / 1e3) * 2 * period_margin,
                      "leakage_power": power.leakage}
 
diff --git a/compiler/tests/21_model_delay_test.py b/compiler/tests/21_model_delay_test.py
index e711c7ca..af1dfa12 100755
--- a/compiler/tests/21_model_delay_test.py
+++ b/compiler/tests/21_model_delay_test.py
@@ -63,7 +63,9 @@ class model_delay_test(openram_test):
 
         # Only compare the delays
         spice_delays = {key:value for key, value in spice_data.items() if 'delay' in key}
+        spice_delays['min_period'] = spice_data['min_period']
         model_delays = {key:value for key, value in model_data.items() if 'delay' in key}
+        model_delays['min_period'] = model_data['min_period']
         debug.info(1,"Spice Delays={}".format(spice_delays))
         debug.info(1,"Model Delays={}".format(model_delays))