diff --git a/app/src/main/res/xml/pref_openapssmb.xml b/app/src/main/res/xml/pref_openapssmb.xml
index 859a75a82b..7a51647782 100644
--- a/app/src/main/res/xml/pref_openapssmb.xml
+++ b/app/src/main/res/xml/pref_openapssmb.xml
@@ -83,7 +83,7 @@
             android:singleLine="true"
             android:title="@string/smbinterval_summary"
             validate:maxNumber="10"
-            validate:minNumber="1"
+            validate:minNumber="3"
             validate:testType="numericRange" />
 
         <info.nightscout.androidaps.utils.textValidator.ValidatingEditTextPreference