diff --git a/Aforc_ERA5/make_ERA5.m b/Aforc_ERA5/make_ERA5.m
index 395ca01ffbb3b9ecdb741adc05066aefca9a7856..6f27ee815de7d10ec6936e3b443e805e5c552af9 100644
--- a/Aforc_ERA5/make_ERA5.m
+++ b/Aforc_ERA5/make_ERA5.m
@@ -97,6 +97,10 @@ if add_waves == 1
     maskwave(maskwave ~= missvalue_wave ) = 1;
     maskwave(maskwave == missvalue_wave ) = NaN ;
     close(nc);
+else
+	lon1wave = NaN;
+	lat1wave = NaN;
+	maskwave = NaN;
 end