diff --git a/scripts/base/utils/addrs.bro b/scripts/base/utils/addrs.bro
index 058aabd96e..f89467c14d 100644
--- a/scripts/base/utils/addrs.bro
+++ b/scripts/base/utils/addrs.bro
@@ -100,7 +100,7 @@ function find_ip_addresses(input: string): string_array &deprecated
 	for ( i in parts )
 		{
 		if ( i % 2 == 1 && is_valid_ip(parts[i]) )
-			output += parts[i];
+			output[|output|] += parts[i];
 		}
 	return output;
 	}