diff --git a/openbsc/src/osmo-bsc/osmo_bsc_main.c b/openbsc/src/osmo-bsc/osmo_bsc_main.c
index 2a4ed1a..3a2306c 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_main.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_main.c
@@ -233,7 +233,8 @@
 	lonstr = strtok_r(NULL, ",", &saveptr);
 	heightstr = strtok_r(NULL, "\0", &saveptr);
 
-	if ((agestr == 0) || (latstr == 0) || (lonstr == 0) || (heightstr == 0))
+	if ((agestr == NULL) || (latstr == NULL) ||
+			(lonstr == NULL) || (heightstr == NULL))
 		ret = 1;
 
 	age = atol(agestr);