diff --git a/tools/generate-ip-mappings.py b/tools/generate-ip-mappings.py
index bec6ac0..2b96989 100755
--- a/tools/generate-ip-mappings.py
+++ b/tools/generate-ip-mappings.py
@@ -38,7 +38,7 @@ def ipv62int64(addr):
         if row[3] == "ZZ":
             continue
         # Skip empty latitude and longitude
-        if row[6] is "" or row[7] is "":
+        if row[6] == "" or row[7] == "":
             continue
 
         if row[0].find(':') == -1: