diff --git a/src/location/GeoIp.zig b/src/location/GeoIp.zig
index 9a698ef..a5384ae 100644
--- a/src/location/GeoIp.zig
+++ b/src/location/GeoIp.zig
@@ -27,37 +27,28 @@ pub fn deinit(self: *GeoIP) void {
 }
 
 pub fn lookup(self: *GeoIP, ip: []const u8) !?Coordinates {
+    const result = lookupInternal(&self.mmdb, ip) catch return null;
+
+    if (!result.found_entry) return null;
+
+    return try self.extractCoordinates(result);
+}
+
+fn lookupInternal(mmdb: *c.MMDB_s, ip: []const u8) !c.MMDB_lookup_result_s {
     const ip_z = try std.heap.c_allocator.dupeZ(u8, ip);
     defer std.heap.c_allocator.free(ip_z);
 
     var gai_error: c_int = 0;
     var mmdb_error: c_int = 0;
 
-    const result = c.MMDB_lookup_string(&self.mmdb, ip_z.ptr, &gai_error, &mmdb_error);
-
-    if (gai_error != 0 or mmdb_error != 0) {
-        return null;
-    }
-
-    if (!result.found_entry) {
-        return null;
-    }
-
-    return try self.extractCoordinates(result);
+    const result = c.MMDB_lookup_string(mmdb, ip_z.ptr, &gai_error, &mmdb_error);
+    if (gai_error != 0 or mmdb_error != 0) return error.MMDBLookupError;
+    return result;
 }
 
 pub fn isUSIP(self: *GeoIP, ip: []const u8) bool {
-    const ip_z = std.heap.c_allocator.dupeZ(u8, ip) catch return false;
-    defer std.heap.c_allocator.free(ip_z);
-
-    var gai_error: c_int = 0;
-    var mmdb_error: c_int = 0;
-
-    const result = c.MMDB_lookup_string(&self.mmdb, ip_z.ptr, &gai_error, &mmdb_error);
-
-    if (gai_error != 0 or mmdb_error != 0 or !result.found_entry) {
-        return false;
-    }
+    const result = lookupInternal(&self.mmdb, ip) catch return false;
+    if (!result.found_entry) return false;
 
     var entry_mut = result.entry;
     const null_term: [*:0]const u8 = @ptrCast(&[_]u8{0});